TT#53700 Switch nfs-mount systemd service from Type oneshot to simple

This service should be stopped when we disable the ngcp-recording-daemon,
but ngcp-service has logic to skip services of Type oneshot.

In this case turning it into a Type=simple is fine because even though
there are no daemons/programs remaining after execution, we do set
RemainAfterExit=yes explicitly.

Change-Id: I3bde666ae1ed19ac56d38b3e011714e66615a378
(cherry picked from commit b290bb8a98)
(cherry picked from commit 519583d28c)

debian/ngcp-rtpengine-recording-daemon.ngcp-rtpengine-recording-nfs-mount.service

@@ -11,7 +11,7 @@ Requires=rpcbind.service
 Requires=nfs-client.target
 
 [Service]
-Type=oneshot
+Type=simple
 RemainAfterExit=yes
 ExecStart=/usr/sbin/ngcp-rtpengine-recording-nfs-setup start
 ExecStop=/usr/sbin/ngcp-rtpengine-recording-nfs-setup stop