utils/kamctl/kamctl.base added documentation of ps command

(cherry picked from commit 5266c7f5ed1e2f6364f646ece3828e259491a6ae)

utils/kamctl/kamctl.base

@@ -323,12 +323,13 @@ DIALPLAN_ATTRS_COLUMN=attrs
 
 usage_base() {
 	echo
-	mecho " -- command 'start|stop|restart'"
+	mecho " -- command 'start|stop|restart|ps'"
 	echo
 cat <<EOF
  restart ............................ restart Kamailio
  start .............................. start Kamailio
  stop ............................... stop Kamailio
+ ps ................................. print Kamailio processes
 EOF
 }