TT#14008 rtpengine-ctl fix to allow override of default values

Change-Id: Ia5e5aafbfdfa28652c153852a664b3212544f74f
(cherry picked from commit 5fa83ce1cb)

utils/rtpengine-ctl

@@ -33,13 +33,16 @@ if (-f $conffile) {
     }
 }
 
-if ($ip && $ip =~ s/:(\d+)$//) {
+if ($ip && $ip =~ s/:(\d+)$// && !$port) {
     $port = $1;
 }
 
 my $argumentstring = "@ARGV";
 $argumentstring = trim($argumentstring);
 
+$ip //= '127.0.0.1';
+$port //= 9900;
+
 if (!$argumentstring || !$optret || $port <= 0 || $port > 65535) {
     showusage();
     exit 1;