JGroupsTransport doesn't initialize properly when it receives an already-connected JGroups channel

When the JGroups channel is connected outside Infinispan, before passing it to JGroupsTransport, the member list is not initialized.

This can lead to strange errors like this one:

java.lang.IllegalArgumentException: Invalid cache list for consistent hash: []
at org.infinispan.distribution.ch.AbstractWheelConsistentHash.setCaches(AbstractWheelConsistentHash.java:96)
at org.infinispan.distribution.ch.ConsistentHashHelper.createConsistentHash(ConsistentHashHelper.java:122)
at org.infinispan.statetransfer.ReplicatedStateTransferManagerImpl.createConsistentHash(ReplicatedStateTransferManagerImpl.java:56)
at org.infinispan.statetransfer.BaseStateTransferManagerImpl.start(BaseStateTransferManagerImpl.java:143)