fix(network-manager): rework how NM is started in debug mode

Instead of running directly NM with --debug, create a drop-in in
nm-config.sh. This will make sure, that we can get the debug output
regardless the way how NM will be started.

modules.d/35network-manager/nm-config.sh

@@ -6,4 +6,12 @@ if [ -n "$netroot" ] || [ -e /tmp/net.ifaces ]; then
     echo rd.neednet >> /etc/cmdline.d/35-neednet.conf
 fi
 
+if getargbool 0 rd.debug -d -y rdinitdebug -d -y rdnetdebug; then
+    mkdir -m 0755 -p /run/NetworkManager/conf.d
+    (
+        echo '[logging]'
+        echo 'level=TRACE'
+    ) > /run/NetworkManager/conf.d/initrd-logging.conf
+fi
+
 nm_generate_connections

modules.d/35network-manager/nm-run.sh

@@ -9,11 +9,7 @@ for i in /usr/lib/NetworkManager/system-connections/* \
          /etc/NetworkManager/system-connections/* \
          /etc/sysconfig/network-scripts/ifcfg-*; do
   [ -f "$i" ] || continue
-  if getargbool 0 rd.debug -d -y rdinitdebug -d -y rdnetdebug; then
-      /usr/sbin/NetworkManager --configure-and-quit=initrd --debug --log-level=trace
-  else
-      /usr/sbin/NetworkManager --configure-and-quit=initrd --no-daemon
-  fi
+  /usr/sbin/NetworkManager --configure-and-quit=initrd --no-daemon
 
   if [ -s /run/NetworkManager/initrd/hostname ]; then
       cat /run/NetworkManager/initrd/hostname > /proc/sys/kernel/hostname