Raise an exception if dangerous Redis commands are issued.

Update docs accordingly.
Typos.
The limited Redis client is now used by the CC module.
Merge remote-tracking branch 'origin/topic/bf_limit_apis' into develop

* origin/topic/bf_limit_apis:
  The limited Redis client is now used by the CC module.
  Typos.
  Raise an exception if dangerous Redis commands are issued.