cli.py: Change default path of mediawiki sync lockfile
Old:
The mediawiki sync lockfile was
/var/lock/scap.operations_mediawiki-config.lock, regardless of the
staging directory.
New:
The mediawiki sync lockfile is /var/lock/scap.<something>.lock
. The
<something>
part depends on stage_dir
. This allows the use of
multiple staging directories on the same deploy server at the same
time without interference.