Adding init-functions file for enviroment of LSB-compliant init scripts

In Ubuntu 14.04 and 16.04, the file of init-functions is placed in /lib/lsb/.

Change-Id: I101ee08a7b7795c41d9ec3eb8833bee0e2f38e1c

@@ -41,7 +41,12 @@ startonos () {
     cmd=$1
     shift
     # Start ONOS as a daemon
+    if test -f /lib/lsb/init-functions; then
+        . /lib/lsb/init-functions
+    else
         . /etc/init.d/functions && true
+    fi
+
     if type daemon | grep -i function >/dev/null 2>&1; then
         # Use 'daemon' function if available
         # Shell metacharacters are passed as arguments to daemon