Revert "Upgrade to httpclient 4.3.6"

Reverts wildfly/wildfly#6968

I'm reverting this because since it went in, CfgFileTestCase has continually failed.

http://brontes.lab.eng.brq.redhat.com/project.html?projectId=WF&testNameId=4543717080903920957&tab=testDetails

Caused by: com.ctc.wstx.exc.WstxParsingException: (was java.io.FileNotFoundException) http://hibernate.org/dtd/hibernate-configuration-3.0.dtd
at [row,col {unknown-source}]: [4,63]
which I'm guessing involves trying to find the DTD at that URL