Replace RemoteCache#getRemoteCacheManager() with getRemoteCacheContainer()

WildFly relies on proxying the RemoteCacheContainer and RemoteCache interfaces to be able to instrument management resource registration.  RemoteCache currently has a getRemoteCacheManager() method that returns an concrete RemoteCacheManager class.  To avoid having to subclass RemoteCacheManager, we should add a new getRemoteCacheContainer() method that returns a RemoteCacheContainer and deprecate the existing method.