[GSS](7.3.z) ARTEMIS-2637 - Resilience around UDP Discovery

            <subsystem xmlns="urn:jboss:domain:messaging:1.4">
                <hornetq-server>
                    <persistence-enabled>true</persistence-enabled>
                    <message-expiry-scan-period>300000</message-expiry-scan-period>
                    <journal-type>NIO</journal-type>
                    <journal-min-files>2</journal-min-files>

                    <discovery-groups>
                        <discovery-group name="dg-group1">
                            <socket-binding>messaging-group</socket-binding>
                            <refresh-timeout>10000</refresh-timeout>
                            <initial-wait-timeout>20000</initial-wait-timeout>
                        </discovery-group>
                    </discovery-groups>

                    <jms-connection-factories>
                        <pooled-connection-factory name="hornetq-ra">
                            <user>jmsuser</user>
                            <password>redhat1!</password>
                            <min-pool-size>10</min-pool-size>
                            <max-pool-size>30</max-pool-size>
                            <discovery-group-ref discovery-group-name="dg-group1"/>
                            <entries>
                                <entry name="java:/JmsXA"/>
                            </entries>
                            <retry-interval>4000</retry-interval>
                            <max-retry-interval>12000</max-retry-interval>
                            <reconnect-attempts>15</reconnect-attempts>
                            <connection-load-balancing-policy-class-name>org.hornetq.api.core.client.loadbalance.RoundRobinConnectionLoadBalancingPolicy</connection-load-balancing-policy-class-name>
                        </pooled-connection-factory>
                    </jms-connection-factories>
                </hornetq-server>
            </subsystem>

        <socket-binding-group name="full-sockets" default-interface="public">
            ...
            <socket-binding name="messaging" port="5445"/>
            <socket-binding name="messaging-group" port="0" multicast-address="${jboss.messaging.group.address:231.7.7.7}" multicast-port="${jboss.messaging.group.port:9876}"/>
            <socket-binding name="messaging-throughput" port="5455"/>
        </socket-binding-group>

[Server:client] 19:50:08,293 ERROR [org.hornetq.ra] (JMSTest-Runner-0) HQ154002: Could not create session: javax.resource.ResourceException: IJ000453: Unable to get managed connection for java:/JmsXA
[Server:client] 	at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.getManagedConnection(AbstractConnectionManager.java:410)
[Server:client] 	at org.jboss.jca.core.connectionmanager.tx.TxConnectionManagerImpl.getManagedConnection(TxConnectionManagerImpl.java:367)
[Server:client] 	at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.allocateConnection(AbstractConnectionManager.java:499)
[Server:client] 	at org.hornetq.ra.HornetQRASessionFactoryImpl.allocateConnection(HornetQRASessionFactoryImpl.java:832)
[Server:client] 	at org.hornetq.ra.HornetQRASessionFactoryImpl.createSession(HornetQRASessionFactoryImpl.java:465)
[Server:client] 	at test.JmsConnectionFactoryRestService$Runner.run(JmsConnectionFactoryRestService.java:164) [classes:]
[Server:client] 	at java.lang.Thread.run(Thread.java:748) [rt.jar:1.8.0_202]
[Server:client] Caused by: javax.resource.ResourceException: IJ000658: Unexpected throwable while trying to create a connection: null
[Server:client] 	at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreArrayListManagedConnectionPool.getConnection(SemaphoreArrayListManagedConnectionPool.java:457)
[Server:client] 	at org.jboss.jca.core.connectionmanager.pool.AbstractPool.getSimpleConnection(AbstractPool.java:479)
[Server:client] 	at org.jboss.jca.core.connectionmanager.pool.AbstractPool.getConnection(AbstractPool.java:451)
[Server:client] 	at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.getManagedConnection(AbstractConnectionManager.java:344)
[Server:client] 	... 6 more
[Server:client] Caused by: javax.resource.ResourceException: Error during setup
[Server:client] 	at org.hornetq.ra.HornetQRAManagedConnection.<init>(HornetQRAManagedConnection.java:171)
[Server:client] 	at org.hornetq.ra.HornetQRAManagedConnectionFactory.createManagedConnection(HornetQRAManagedConnectionFactory.java:157)
[Server:client] 	at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreArrayListManagedConnectionPool.createConnectionEventListener(SemaphoreArrayListManagedConnectionPool.java:874)
[Server:client] 	at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreArrayListManagedConnectionPool.getConnection(SemaphoreArrayListManagedConnectionPool.java:416)
[Server:client] 	... 9 more
[Server:client] Caused by: javax.resource.ResourceException: Failed to create session factory
[Server:client] 	at org.hornetq.ra.HornetQRAManagedConnection.setup(HornetQRAManagedConnection.java:887)
[Server:client] 	at org.hornetq.ra.HornetQRAManagedConnection.<init>(HornetQRAManagedConnection.java:160)
[Server:client] 	... 12 more
[Server:client] Caused by: javax.jms.JMSException: Failed to create session factory
[Server:client] 	at org.hornetq.jms.client.HornetQConnectionFactory.createConnectionInternal(HornetQConnectionFactory.java:587)
[Server:client] 	at org.hornetq.jms.client.HornetQConnectionFactory.createXAConnection(HornetQConnectionFactory.java:143)
[Server:client] 	at org.hornetq.ra.HornetQRAManagedConnection.setup(HornetQRAManagedConnection.java:871)
[Server:client] 	... 13 more
[Server:client] Caused by: HornetQException[errorType=CONNECTION_TIMEDOUT message=HQ119012: Timed out waiting to receive initial broadcast from cluster]
[Server:client] 	at org.hornetq.core.client.impl.ServerLocatorImpl.createSessionFactory(ServerLocatorImpl.java:859)
[Server:client] 	at org.hornetq.jms.client.HornetQConnectionFactory.createConnectionInternal(HornetQConnectionFactory.java:583)
[Server:client] 	... 15 more