move refreshLinks cron logs to /var/log/mediawiki

instead of using /home/mwdeploy

there has been discussion in the past about this,
where i pointed out logs are all over the place
and we should probably put them all there.

there was some patch by Reedy that never got merged
also see: I2cfbb34d0d1868

Change-Id: If043ed0e33623ded93a0319cb656fc60d6d5b26f
Merge "move refreshLinks cron logs to /var/log/mediawiki" into production