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

This reverts commit 25d0b121e9552ef86f4036e3272f02a375f6ff77.
Revert "AMBARI-7824. Slider View: Unable to create app when cluster is secured - keytab doesnt exist (srimanth)"

This reverts commit a5b37ab6d0d18b6d09a42fd7c564278ae3f61103.