Add 'fluoride' git-deploy target.

The script that reported MediaWiki errors to ganglia was previously deployed
via Puppet. I removed it in change If035a0ef2 as part of the refactor of the
EventLogging module. (It was included in the EventLogging module as a
convenient hack.)

The code only needs to be deployed to vanadium, so the git-deploy setup should
be identical to EventLogging's. You can compare each line in this diff to the
one above it.

Change-Id: I825a3ba2e38b59b1214c52179a1761bd1a20f042