We now run all the daemon with a new option from Nautilus 14.2.1 which
allows us to tell to a daemon to not log on file. However, we can decide
to activate logging by editing the configuration flag 'log_to_file' via
the centralized config store like this for a particular daemon:

ceph config set mon.a log_to_file true

This is useful when a daemon keeps crashing and we want to collect log
files on the system.

Fixes: https://github.com/rook/rook/issues/2881

Signed-off-by: Sébastien Han <seb@redhat.com>