QPID-5599: C++ Broker silently ignores --max-connections option when no ACL file is loaded

Temporarily revert creation of ACL with null rule set as it subverts
the CREATE LINK security check and self test. Real fix coming shortly.



git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1574219 13f79535-47bb-0310-9956-ffa450edef68