[#YANGTOOLS-625] getting protocol value from the security rule object in SecurityRuleListener code is throwing exception.

Build used :
===================
Karaf distribution from latest ODL Boron master code

There are some changes merged in project neutron to revises yang model for security groups in file model/src/main/yang/neutron-secgroups.yang

leaf protocol {
  type union {
    type uint8;
    type identityref {
      base "constants:protocol-base";
    }
  }
  description "The protocol that is matched by the security group rule.";
}

after this changes, listener code register for SecurityRule is failing at runtime at statement

where securityRule is instance of
org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.secgroups.rev150712.security.rules.attributes.security.rules.SecurityRule

java.lang.ClassCastException: java.lang.String cannot be cast to org.opendaylight.yangtools.yang.common.QName
	at org.opendaylight.yangtools.binding.data.codec.impl.IdentityCodec.deserialize(IdentityCodec.java:17)[118:org.opendaylight.mdsal.binding-dom-codec:0.9.0.SNAPSHOT]
	at org.opendaylight.yangtools.binding.data.codec.impl.UnionTypeCodec.deserialize(UnionTypeCodec.java:103)[118:org.opendaylight.mdsal.binding-dom-codec:0.9.0.SNAPSHOT]
	at org.opendaylight.yangtools.binding.data.codec.impl.LeafNodeCodecContext.deserializeObject(LeafNodeCodecContext.java:199)[118:org.opendaylight.mdsal.binding-dom-codec:0.9.0.SNAPSHOT]
	at org.opendaylight.yangtools.binding.data.codec.impl.DataObjectCodecContext.getBindingChildValue(DataObjectCodecContext.java:328)[118:org.opendaylight.mdsal.binding-dom-codec:0.9.0.SNAPSHOT]
	at org.opendaylight.yangtools.binding.data.codec.impl.KeyedListNodeCodecContext.getBindingChildValue(KeyedListNodeCodecContext.java:66)[118:org.opendaylight.mdsal.binding-dom-codec:0.9.0.SNAPSHOT]
	at org.opendaylight.yangtools.binding.data.codec.impl.LazyDataObject.getBindingData(LazyDataObject.java:148)[118:org.opendaylight.mdsal.binding-dom-codec:0.9.0.SNAPSHOT]
	at org.opendaylight.yangtools.binding.data.codec.impl.LazyDataObject.invoke(LazyDataObject.java:71)[118:org.opendaylight.mdsal.binding-dom-codec:0.9.0.SNAPSHOT]
	at com.sun.proxy.$Proxy178.getProtocol(Unknown Source)
	at org.opendaylight.netvirt.neutronvpn.NeutronSecurityRuleListener.toAceBuilder(NeutronSecurityRuleListener.java:132)[327:org.opendaylight.netvirt.neutronvpn-impl:0.3.0.SNAPSHOT]
	at org.opendaylight.netvirt.neutronvpn.NeutronSecurityRuleListener.add(NeutronSecurityRuleListener.java:76)[327:org.opendaylight.netvirt.neutronvpn-impl:0.3.0.SNAPSHOT]
	at org.opendaylight.netvirt.neutronvpn.NeutronSecurityRuleListener.add(NeutronSecurityRuleListener.java:44)[327:org.opendaylight.netvirt.neutronvpn-impl:0.3.0.SNAPSHOT]
	at org.opendaylight.genius.datastoreutils.AsyncDataTreeChangeListenerBase$DataTreeChangeHandler.run(AsyncDataTreeChangeListenerBase.java:121)[300:org.opendaylight.genius.mdsalutil-api:0.1.0.SNAPSHOT]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[:1.8.0_71]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[:1.8.0_71]
	at java.lang.Thread.run(Thread.java:745)[:1.8.0_71]

Note:
POST/GET restconf is working but listening on data change notification does not work. SecurityRule change notification is received, but throws exception in code when we try to get protocol value using method "getProtocol()" .

For reproducing this issue, Pls add a SecurityRule Listener and get the protocol value from securityRule object on receiving SeucirtyRule add event.

[YANGTOOLS-625] getting protocol value from the security rule object in SecurityRuleListener code is throwing exception. Created: 27/Jun/16 Updated: 10/Apr/22 Resolved: 01/Aug/16
Status:	Resolved
Project:	yangtools
Component/s:	None
Affects Version/s:	None
Fix Version/s:	None

[YANGTOOLS-625] getting protocol value from the security rule object in SecurityRuleListener code is throwing exception. Created: 27/Jun/16 Updated: 10/Apr/22 Resolved: 01/Aug/16