MT#55421 fix deleting domains

xmlrpc request such as domain.reload can fail,
when database content was not yet replicated.

Change-Id: I769f9470b526ef5175826e6c18cbe28c6c1501ca
(cherry picked from commit afe80f0110)

lib/NGCP/Panel/Utils/XMLDispatcher.pm

@@ -155,6 +155,7 @@ sub sip_domain_reload {
 </methodCall>
 EOF
 
+    sleep(2);
     my @ret = dispatch($c, "proxy-ng", 1, 1, $reload_command); # we're only checking first host here
 
     if (grep { $_->[1] == 0 } @ret) {