Comment 1 for bug 1401661

@Dmitriy(Borodaenko), should we create note about snapshot in operations guide, instead of instruction in the snapshot itself?

Basically, to understand what snapshot contains one should look at template that is used for creating snapshot:
https://github.com/stackforge/fuel-web/blob/b1cb2f73c147c394fd6a7d91667f61859e6bc20a/nailgun/nailgun/settings.yaml#L643