Move SIP upgrade into app script

src/freedombone-app-sip

 VOIP_TURN_NONCE=
 
 function upgrade_sip {
-	echo -n ''
+	# remove the original sipwitch daemon if it exists
+	if [ -f /etc/init.d/sipwitch ]; then
+		rm -f /etc/init.d/sipwitch
+	fi
 }
 
 function backup_local_sip {

src/freedombone-upgrade

 	fi
 fi
 
-# remove the original sipwitch daemon if it exists
-if [ -f /etc/init.d/sipwitch ]; then
-	rm -f /etc/init.d/sipwitch
-fi
-
 if [ -f /usr/bin/reset-tripwire ]; then
 	echo '