network-manager: support a defaults file in the init script

Sometimes it is useful to pass some parameters to NetworkManager when it
starts (e.g. --log-level) instead of editting NetworkManager.conf. Allow
the user add a file with a NETWORKMANAGER_ARGS variable containing such
flags. This is simpler than overriding the whole startup script (e.g. by
means of a rootfs overlay).

Signed-off-by: Carlos Santos <casantos@datacom.ind.br>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/network-manager/S45network-manager

@@ -1,5 +1,8 @@
 #!/bin/sh
 
+# Allow a few customizations from a config file
+test -r /etc/default/NetworkManager && . /etc/default/NetworkManager
+
 prefix=/usr
 exec_prefix=/usr
 sbindir=${exec_prefix}/sbin
@@ -14,7 +17,7 @@ case "$1" in
 		printf "Starting NetworkManager ... "
 		[ ! -d /var/run/NetworkManager ] && install -d /var/run/NetworkManager
 		if [ -z "$PID" ]; then
-			$NETWORKMANAGER_BIN
+			$NETWORKMANAGER_BIN $NETWORKMANAGER_ARGS
 		fi
 		if [ ! -z "$PID" -o $? -gt 0 ]; then
 			echo "failed!"