Revert "AMBARI-3054. User Preference to show 'Background Operations'. (xiwang)"

This reverts commit 68f77e6536cb1293b58aefc32300395305795792.
Revert "AMBARI-3632. Need ability to remove hbase master (xiwang)"

This reverts commit 0dba52dfc703f44b440945edfd9d2d62f2303735.
Revert "AMBARI-2618. host actions UI changes based on new stop/start all and delete func (xiwang)"

This reverts commit e10272390444e56b0e4cacfda0bc36f6985e300d.