Revert "AMBARI-7824. Slider View: Unable to create app when cluster is secured - keytab doesnt exist. Doc updates (srimanth)"

This reverts commit 8c59e4a3d049435e66a3332958e1a30ed8d4b347.
Revert "AMBARI-7824. Slider View: Unable to create app when cluster is secured - keytab doesnt exist (srimanth)"

This reverts commit 336e2b1ff3984f892c4d1d8c1b3fa93a86026de9.