Must be able to regenerate master key in maintenance mode

[PVince81]

Steps

1. Setup OC with master key mode
2. occ maintenance:mode --on
3. occ encryption:recreate-master-key

Expected result

Command works

Actual result

Command not available in maintenance mode while all others are.

This is bad because if I want to fiddle with encryption keys I want my instance to be in maintenance mode.

The command should also initiate maintenance mode while running to avoid access during decryption.
Note that occ decrypt-all usually does not initiate maintenance mode.

Version

ownCloud 10.0.10 RC1