Fix permissions in labs-vagrant
Fix permissions in labs-vagrant

The MediaWiki-Vagrant variant has been updated to use $::share_owner and
$::share_group facts as default uid/gid. However, these have been left
undefined in labs-vagrant, causing permission problems (everything was
effectively set to be owned by root). This patch sets these two facts in
labs-vagrant as well.

Bug: T94469
Change-Id: I75f5d46086ff3b836cbb1f8621ab0f2bf5e1f58d

wikimedia/mediawiki-vagrant,HarriAlasi/wiki3dviewer,HarriAlasi/wiki3dviewer,stuartbman/mediawiki-vagrant,wikimedia/mediawiki-vagrant,stuartbman/mediawiki-vagrant,wikimedia/mediawiki-vagrant,HarriAlasi/wiki3dviewer,wikimedia/mediawiki-vagrant,stuartbman/mediawiki-vagrant,HarriAlasi/wiki3dviewer,stuartbman/mediawiki-vagrant,HarriAlasi/wiki3dviewer,HarriAlasi/wiki3dviewer,stuartbman/mediawiki-vagrant,stuartbman/mediawiki-vagrant,HarriAlasi/wiki3dviewer,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,stuartbman/mediawiki-vagrant