client: test_rpc_server.h: Log interface id if a request for an unimplemented...

client: test_rpc_server.h: Log interface id if a request for an unimplemented operation was received.

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@3543 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534