Clean up test suite

* use named HotRod endpoints instead of direct address and port
* fix unreliable async tests
* make the HotRod client tests run significantly faster
* formatting of build-testsuite.xml - tabs to 4 spaces
Use exclusively HttpClient 4 in tests, minor test suite fixes

* fix profiles for running tests only for a specific client (REST,MEMCACHED,HOTROD)
* enable running a single test outside of any group