Ambari 2.7 - Operations audit feature

[#1]

Starting from Ambari 2.7 there are 2 new features to track who did what.

1. In operations history - for every operation there is a user name associated.

2. In Prior versions there is no way to find out who launched Install/Add wizards. Starting from 2.7 there is Username name being shows in the UI.

These features make Administrators life easier to track who did what.