Update man pages

Updates the man pages based on the latest oslo.config and
Keystone code. oslo.config is version 1.2.0.

To generate the man pages, ran

 tools/with_venv.sh bin/keystone-all -h

and copied the output to the man page. A couple of changes were
required because of the output formatting.
1) Escape * in *.config otherwise it's considered emphasis without
   end.
2) --log-file is split to separate lines which results in a space
   in the output, so put it back together.

Change-Id: Ic76b7eafd04551ec01a3c117b9d5a73471b1e4ce
Merge "Update man pages"