Revert "Merge branch 'trunk' of https://git-wip-us.apache.org/repos/asf/ambari into test"

This reverts commit 28c249e5332515a8f98fe18de872380fc1f30faa, reversing
changes made to e7089d4c786e39b988e79eb1ed6d38cefa99891d.
Revert "AMBARI-5663: Python Client should support HTTP Headers.(Subin)"

This reverts commit e7089d4c786e39b988e79eb1ed6d38cefa99891d.