beta: Remove File['/usr/local/apache/common'] from ::beta::common

Fixes:
  err: Could not retrieve catalog from remote server: Error 400 on
  SERVER: Duplicate definition: File[/usr/local/apache/common] is
  already defined in file
  /etc/puppet/modules/mediawiki/manifests/sync.pp at line 41; cannot
  redefine at /etc/puppet/modules/beta/manifests/common.pp:20 on node
  i-0000011b.eqiad.wmflabs

Change-Id: I957dcba6a01767828871d77e1f6934ee125fae69
Merge "beta: Remove File['/usr/local/apache/common'] from ::beta::common" into production