Adding init.d script

For booting on systems where upstart isnt used, such as
Debian, an init.d script can be used.

Change-Id: I2fadc32dc73f31d733c424591d64448059de89e3
Closes-Bug: #1502542

etc/initd/amphora-agent

@@ -0,0 +1,67 @@
+### BEGIN INIT INFO
+# Provides:          amphora-agent
+# Required-Start:    $remote_fs $syslog $network
+# Required-Stop:     $remote_fs $syslog $network
+# Default-Start:     2 3 4 5
+# Default-Stop:      0 1 6
+# Short-Description: Runs the Amphora Agent processes
+# Description:       This script runs Octavia Amphora Agent processes.
+#                    This script will start the Amphora Agent services
+#                    and kill them.
+### END INIT INFO
+
+# Using the lsb functions to perform the operations.
+. /lib/lsb/init-functions
+# Process name ( For display )
+NAME=amphora-agent
+# Daemon name, where is the actual executable
+DAEMON=/usr/local/bin/amphora-agent
+# pid file for the daemon
+PIDFILE=/var/run/amphora-agent.pid
+
+# If the daemon is not there, then exit.
+test -x $DAEMON || exit 5
+
+case $1 in
+ start)
+  # Checked the PID file exists and check the actual status of process
+  if [ -e $PIDFILE ]; then
+   status_of_proc -p $PIDFILE $DAEMON "$NAME process" && status="0" || status="$?"
+   # If the status is SUCCESS then don't need to start again.
+   if [ $status = "0" ]; then
+    exit # Exit
+   fi
+  fi
+  # Start the daemon.
+  log_daemon_msg "Starting the process" "$NAME"
+  # Start the daemon with the help of start-stop-daemon
+  # Log the message appropriately
+  if start-stop-daemon --start -m --quiet --oknodo --pidfile $PIDFILE --startas $DAEMON -- --config-file /etc/octavia/amphora-agent.conf ; then
+   log_end_msg 0
+  else
+   log_end_msg 1
+  fi
+  ;;
+ stop)
+  # Stop the daemon.
+  if [ -e $PIDFILE ]; then
+   status_of_proc -p $PIDFILE $DAEMON "Stoppping the $NAME process" && status="0" || status="$?"
+   if [ "$status" = 0 ]; then
+    start-stop-daemon --stop --quiet --oknodo --pidfile $PIDFILE
+    /bin/rm -rf $PIDFILE
+   fi
+  else
+   log_daemon_msg "$NAME process is not running"
+   log_end_msg 0
+  fi
+  ;;
+ restart)
+  # Restart the daemon.
+  $0 stop && sleep 2 && $0 start
+  ;;
+ *)
+  # For invalid arguments, print the usage message.
+  echo "Usage: $0 {start|stop|restart|reload|status}"
+  exit 2
+  ;;
+esac