ConfigOptsProxy have been implemented only pika driver while
the oslo.messaging allow to pass the query string for all drivers.
This change fixes that.
Closes-Bug: #1666903
Closes-Bug: #1607889
Next step is to validate the query with ConfigOptsProxy, to
raise appropriate exception in case of mis-configuration.
Change-Id: I573334e774ccf33ecd27a85067045f3c6489ee89