Make --log-stderr available from ngcp-rtpengine-daemon.init

debian/ngcp-rtpengine-daemon.default

@@ -40,3 +40,4 @@ TABLE=0
 # HOMER_PROTOCOL=udp
 # HOMER_ID=2001
 # RECORDING_DIR=/var/spool/rtpengine/
+# LOG_STDERR="no"

debian/ngcp-rtpengine-daemon.init

@@ -55,6 +55,7 @@ if [ ! -z "$SUBSCRIBE_KEYSPACES" ]; then
 		OPTIONS="$OPTIONS --subscribe-keyspace=$ks"
 	done
 fi
+
 [ -z "$ADDRESS" ] || OPTIONS="$OPTIONS --interface=$ADDRESS"
 [ -z "$ADV_ADDRESS" ] || OPTIONS="$OPTIONS!$ADV_ADDRESS"
 [ -z "$ADDRESS_IPV6" ] || OPTIONS="$OPTIONS --interface=$ADDRESS_IPV6"
@@ -99,6 +100,10 @@ if test "$FORK" = "no" ; then
 	OPTIONS="$OPTIONS --foreground"
 fi
 
+if test "$LOG_STDERR" = "yes" ; then
+	OPTIONS="$OPTIONS --log-stderr"
+fi
+
 if [ -x /usr/sbin/ngcp-virt-identify ]; then
 	if /usr/sbin/ngcp-virt-identify --type container; then
 		VIRT="yes"