Use ini module instead of copying the whole NetworkManager.conf

roles/common/files/NetworkManager.conf

-# Configuration file for NetworkManager.
-#
-# See "man 5 NetworkManager.conf" for details.
-#
-# The directories /usr/lib/NetworkManager/conf.d/ and /run/NetworkManager/conf.d/
-# can contain additional configuration snippets installed by packages. These files are
-# read before NetworkManager.conf and have thus lowest priority.
-# The directory /etc/NetworkManager/conf.d/ can contain additional configuration
-# snippets. Those snippets are merged last and overwrite the settings from this main
-# file.
-#
-# The files within one conf.d/ directory are read in asciibetical order.
-#
-# If /etc/NetworkManager/conf.d/ contains a file with the same name as
-# /usr/lib/NetworkManager/conf.d/, the latter file is shadowed and thus ignored.
-# Hence, to disable loading a file from /usr/lib/NetworkManager/conf.d/ you can
-# put an empty file to /etc with the same name. The same applies with respect
-# to the directory /run/NetworkManager/conf.d where files in /run shadow
-# /usr/lib and are themselves shadowed by files under /etc.
-#
-# If two files define the same key, the one that is read afterwards will overwrite
-# the previous one.
-
-[main]
-#plugins=ifcfg-rh,ibft
-dhcp=dhclient
-
-
-[logging]
-# When debugging NetworkManager, enabling debug logging is of great help.
-#
-# Logfiles contain no passwords and little sensitive information. But please
-# check before posting the file online. You can also personally hand over the
-# logfile to a NM developer to treat it confidential. Meet us on #nm on freenode.
-# Please post full logfiles except minimal modifications of private data.
-#
-# You can also change the log-level at runtime via
-#   $ nmcli general logging level TRACE domains ALL
-# However, usually it's cleaner to enable debug logging
-# in the configuration and restart NetworkManager so that
-# debug logging is enabled from the start.
-#
-# You will find the logfiles in syslog, for example via
-#   $ journalctl -u NetworkManager
-#
-# Note that debug logging of NetworkManager can be quite verbose. Some messages
-# might be rate-limited by the logging daemon (see RateLimitIntervalSec, RateLimitBurst
-# in man journald.conf). Please disable rate-limiting before collecting debug logs.
-#
-#level=TRACE
-#domains=ALL

roles/common/tasks/networking.yml

@@ -11,9 +11,14 @@
 
 - name: Set dhclient as dhcp client for NetworkManager (admin issue 19)
   become: yes
-  copy:
-    src: NetworkManager.conf
-    dest: /etc/NetworkManager/NetworkManager.conf
+  ini_file:
+    path: /etc/NetworkManager/NetworkManager.conf
+    section: main
+    option: dhcp
+    value: dhclient
+    no_extra_spaces: yes
+    create: no
+    backup: yes
   notify:
     - reload nm
     - restart network