Clear service group when editing firewall rule

Change-Id: I4cf19e7b306bd693643d347ade7c85517aba8479
Closes-Bug: #1770567
(cherry picked from commit 2da24a4)

o11nplugin-contrail-workflows/src/main/js/workflows/editFirewallRule.js

@@ -16,6 +16,7 @@ if(matchTags != null) {
 rule.setMatchTags(mTags);
 
 if(serviceType == "manual") {
+    rule.clearServiceGroup();
     var service = new ContrailFirewallServiceType();
     service.setProtocol(serviceProtocol);
     service.setSrcPorts(ContrailUtils.parsePortsOfFirewallRule(serviceSrcPorts));