Fixed Apache Connector test case that was throwing an exception when using the default BasicClientConnManager, which is not recommended for a multi-threaded client requests.

Fixed Apache Connector test case that was throwing an exception when using the default BasicClientConnManager, which is not recommended for a multi-threaded client requests. 

"javax.ws.rs.ProcessingException: java.lang.IllegalStateException: Invalid use of BasicClientConnManager: connection still allocated.
Make sure to release the connection before allocating another one."

Upgraded Apache HttpClient to 4.2.5 which includes bunch of critical fixes since 4.2.3 (http://www.apache.org/dist/httpcomponents/httpclient/RELEASE_NOTES-4.2.x.txt).