[WFLY-1927] Remove unnecessary File.mkdir() calls
[WFLY-1911] / [WFLY-490] Additional checks on if a username has been specified in advance so when used in scripted mode local authentication will be automatically disabled if a username has been supplied.
[WFLY-1911] Also a minor update to the testsuite.  When these tests were first written it was mandatory that a user was defined before the server could be accessed, as a result a dummy test suite user was added for testing.  However once the local authentication mechanism was added these users were no longer needed.

The tests however are attempting to connect to the server using an invalid username/password combination - this is now removed.
WFLY-1719 ClassCastException on clustered deployement.
Infinispan 5.2.x enabled recovery by default.  Disable recovery in infinispan-defaults.xml to match default for Transaction resource.
WFLY-1910 NotSerializableException when Infinispan cache being committed
Undertow stores the authenticated session in the HttpSession using a special attribute.  This attribute belongs in the local session context so that it is not replicated.