ISPN-4878 StateTransferSuppressIT always fails: the protobuf metadata

cache can't start with state transfer suspended

Disable awaitInitialTransfer in the ___protobuf_metadata configuration.

https://issues.jboss.org/browse/ISPN-4878

@anistor I considered disabling awaitInitialTransfer only for the test with a custom ___protobuf_metadata configuration, but custom interceptors are not allowed in the server configuration. The tests seem to pass, so I guess it's OK to make it the default.