beta: sudo policy for refreshCdbJsonFiles

/usr/local/bin/refreshCdbJsonFiles has been added to scap script but was
lacking a sudo policy to let 'mwdeploy' user to execute it as
'l10nupdate' user.

Caused spam in cron mail recipients.

Change-Id: Ib7fb882508423e976df92873708d1cc77eeabb10
Merge "beta: sudo policy for refreshCdbJsonFiles" into production