MT#10059 allow freeform interface definitions in init.d script

Squashed commit of the following:

commit 0f98bd7304c484740b7d3416bd8843205e1b589f
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Tue Dec 16 13:37:06 2014 -0500

    fix init script

commit 90dc259399aad0de86fcfd2c76b03b4e1cad2157
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Tue Dec 16 12:17:42 2014 -0500

    MT#10059 allow freeform interface definitions in init.d script

debian/ngcp-rtpengine-daemon.default

@@ -2,10 +2,9 @@ RUN_RTPENGINE=no
 LISTEN_TCP=25060
 LISTEN_UDP=12222
 LISTEN_NG=22222
-# ADDRESS=...
-# ADV_ADDRESS=...
-# ADDRESS_IPV6=...
-# ADV_ADDRESS_IPV6=...
+# INTERFACES="123.234.345.456"
+# INTERFACES="internal/12.23.34.45 external/23.34.45.54"
+# INTERFACES="12.23.34.45!23.34.45.56"
 TIMEOUT=60
 SILENT_TIMEOUT=3600
 PIDFILE=/var/run/ngcp-rtpengine-daemon.pid

debian/ngcp-rtpengine-daemon.init

@@ -43,6 +43,11 @@ set -e
 
 OPTIONS=""
 
+if [ ! -z "$INTERFACES" ]; then
+	for interface in $INTERFACES; do
+		OPTIONS="$OPTIONS --interface=$interface"
+	done
+fi
 [ -z "$ADDRESS" ] || OPTIONS="$OPTIONS --interface=$ADDRESS"
 [ -z "$ADV_ADDRESS" ] || OPTIONS="$OPTIONS!$ADV_ADDRESS"
 [ -z "$ADDRESS_IPV6" ] || OPTIONS="$OPTIONS --interface=$ADDRESS_IPV6"