Yang Wang 4bc7545e43
Add enterprise mode and refactor license check (#51864) (#52115)
Add enterprise operation mode to properly map enterprise license.

Aslo refactor XPackLicenstate class to consolidate license status and mode checks.
This class has many sychronised methods to check basically three things:
* Minimum operation mode required
* Whether security is enabled
* Whether current license needs to be active

Depends on the actual feature, either 1, 2 or all of above checks are performed.
These are now consolidated in to 3 helper methods (2 of them are new).
The synchronization is pushed down to the helper methods so actual checking
methods no longer need to worry about it.

resolves: #51081
2020-02-21 14:18:18 +11:00
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