Log: controld,libcrmcommon: improve attrd IPC API messages

Previously, connect_and_send_attrd_request() would log error messages for
failures, attrd IPC APIs would log debug messages with the result whether
success or failure, and then callers would log or output failures again.

Now, connect_and_send_attrd_request() does not log, the attrd IPC APIs log a
debug message before sending the request, and the callers log or output
failures.