network: change license of examples to MIT-0

Arguably, CC0 is just fine for examples since they are not code. But it's
easier to be consistent and just use MIT-0 for all "documentation". Thus,
the license is changed similarly code examples under man/.

Based on 'git shortlog -ns network/*' and 'git log -p', the following folks
should ack this:
  Zbigniew Jędrzejewski-Szmek
  Lennart Poettering
  Tom Gundersen
  Yu Watanabe
  Daan De Meyer
  Marc-André Lureau

LICENSES/README.md

@@ -46,10 +46,10 @@ The following exceptions apply:
    - src/basic/siphash24.c
    - src/basic/siphash24.h
    - tools/check-includes.pl
-   - config files and examples under /network
   * the following sources are licensed under the **MIT-0** license:
    - all examples under man/
    - src/systemctl/systemd-sysv-install.SKELETON
+   - config files and examples under /network
  * the following sources are under **Public Domain** (LicenseRef-murmurhash2-public-domain):
    - src/basic/MurmurHash2.c
    - src/basic/MurmurHash2.h

network/80-6rd-tunnel.network

@@ -1,7 +1,7 @@
-# SPDX-License-Identifier: CC0-1.0
+# SPDX-License-Identifier: MIT-0
 #
 # This config file is installed as part of systemd.
-# It may be freely copied and edited (following the Creative Commons Zero v1.0 Universal License).
+# It may be freely copied and edited (following the MIT No Attribution license).
 #
 # To make local modifications, one of the following methods may be used:
 # 1. add a drop-in file that extends this file by creating the

network/80-container-host0.network

@@ -1,7 +1,7 @@
-# SPDX-License-Identifier: CC0-1.0
+# SPDX-License-Identifier: MIT-0
 #
 # This config file is installed as part of systemd.
-# It may be freely copied and edited (following the Creative Commons Zero v1.0 Universal License).
+# It may be freely copied and edited (following the MIT No Attribution license).
 #
 # To make local modifications, one of the following methods may be used:
 # 1. add a drop-in file that extends this file by creating the

network/80-container-vb.network

@@ -1,7 +1,7 @@
-# SPDX-License-Identifier: CC0-1.0
+# SPDX-License-Identifier: MIT-0
 #
 # This config file is installed as part of systemd.
-# It may be freely copied and edited (following the Creative Commons Zero v1.0 Universal License).
+# It may be freely copied and edited (following the MIT No Attribution license).
 #
 # To make local modifications, one of the following methods may be used:
 # 1. add a drop-in file that extends this file by creating the

network/80-container-ve.network

@@ -1,7 +1,7 @@
-# SPDX-License-Identifier: CC0-1.0
+# SPDX-License-Identifier: MIT-0
 #
 # This config file is installed as part of systemd.
-# It may be freely copied and edited (following the Creative Commons Zero v1.0 Universal License).
+# It may be freely copied and edited (following the MIT No Attribution license).
 #
 # To make local modifications, one of the following methods may be used:
 # 1. add a drop-in file that extends this file by creating the

network/80-container-vz.network

@@ -1,7 +1,7 @@
-# SPDX-License-Identifier: CC0-1.0
+# SPDX-License-Identifier: MIT-0
 #
 # This config file is installed as part of systemd.
-# It may be freely copied and edited (following the Creative Commons Zero v1.0 Universal License).
+# It may be freely copied and edited (following the MIT No Attribution license).
 #
 # To make local modifications, one of the following methods may be used:
 # 1. add a drop-in file that extends this file by creating the

network/80-ethernet.network.example

@@ -1,7 +1,7 @@
-# SPDX-License-Identifier: CC0-1.0
+# SPDX-License-Identifier: MIT-0
 #
 # This example config file is installed as part of systemd.
-# It may be freely copied and edited (following the Creative Commons Zero v1.0 Universal License).
+# It may be freely copied and edited (following the MIT No Attribution license).
 #
 # To use the file, one of the following methods may be used:
 # 1. add a symlink from /etc/systemd/network to the current location of this file,

network/80-vm-vt.network

@@ -1,7 +1,7 @@
-# SPDX-License-Identifier: CC0-1.0
+# SPDX-License-Identifier: MIT-0
 #
 # This config file is installed as part of systemd.
-# It may be freely copied and edited (following the Creative Commons Zero v1.0 Universal License).
+# It may be freely copied and edited (following the MIT No Attribution license).
 #
 # To make local modifications, one of the following methods may be used:
 # 1. add a drop-in file that extends this file by creating the

network/80-wifi-adhoc.network

@@ -1,7 +1,7 @@
-# SPDX-License-Identifier: CC0-1.0
+# SPDX-License-Identifier: MIT-0
 #
 # This config file is installed as part of systemd.
-# It may be freely copied and edited (following the Creative Commons Zero v1.0 Universal License).
+# It may be freely copied and edited (following the MIT No Attribution license).
 #
 # To make local modifications, one of the following methods may be used:
 # 1. add a drop-in file that extends this file by creating the

network/80-wifi-ap.network.example

@@ -1,7 +1,7 @@
-# SPDX-License-Identifier: CC0-1.0
+# SPDX-License-Identifier: MIT-0
 #
 # This example config file is installed as part of systemd.
-# It may be freely copied and edited (following the Creative Commons Zero v1.0 Universal License).
+# It may be freely copied and edited (following the MIT No Attribution license).
 #
 # To use the file, one of the following methods may be used:
 # 1. add a symlink from /etc/systemd/network to the current location of this file,

network/80-wifi-station.network.example

@@ -1,7 +1,7 @@
-# SPDX-License-Identifier: CC0-1.0
+# SPDX-License-Identifier: MIT-0
 #
 # This example config file is installed as part of systemd.
-# It may be freely copied and edited (following the Creative Commons Zero v1.0 Universal License).
+# It may be freely copied and edited (following the MIT No Attribution license).
 #
 # To use the file, one of the following methods may be used:
 # 1. add a symlink from /etc/systemd/network to the current location of this file,

network/99-default.link

@@ -1,7 +1,7 @@
-# SPDX-License-Identifier: CC0-1.0
+# SPDX-License-Identifier: MIT-0
 #
 # This config file is installed as part of systemd.
-# It may be freely copied and edited (following the Creative Commons Zero v1.0 Universal License).
+# It may be freely copied and edited (following the MIT No Attribution license).
 #
 # To make local modifications, one of the following methods may be used:
 # 1. add a drop-in file that extends this file by creating the