MT#11125 don't restart prosody after install if node is not proxy

Change-Id: I57a84b241623cf7f86534912a7d976b41beed2b2

debian/ngcp-prosody-modules.postinst

@@ -1,4 +1,9 @@
 #!/bin/sh
+if [ -r /etc/default/ngcp-roles ] ; then
+	. /etc/default/ngcp-roles
+else
+	NGCP_IS_PROXY=no
+fi
 
 case "$1" in
 	configure)
@@ -15,13 +20,15 @@ case "$1" in
 				;;
 			esac
 		fi
-		if [ -x "/etc/init.d/prosody" ]; then
+		if [ -x "/etc/init.d/prosody" ] && [ "$NGCP_IS_PROXY" == "yes" ]; then
 			echo "Restarting prosody service"
 			if [ -x "$(which invoke-rc.d 2>/dev/null)" ]; then
 				invoke-rc.d prosody restart || true
 			else
 				/etc/init.d/prosody restart || true
 			fi
+		elif [ "$NGCP_IS_PROXY" != "yes" ]; then
+			echo "prosody restart skipped, no role 'proxy' assigned to node."
 		fi
 	;;
 	abort-upgrade|abort-remove|abort-deconfigure)