labs-vagrant: Fix initial clone and ownership

Followup to I3eea91a5933af31457a3ac24624e0fda82d61849. Fix an ordering
issue in git::clone where the File resources for the target directory
was applied in the wrong order for creating clones in root owned
directories. Also change the applied permissions to have the
MediaWiki-Vagrant clone owned by vagrant:wikidev instead of
vagrant:www-data. Add a File resource to change the permissions on
the log output directory to allow www-data to write there.

Change-Id: I194d788d1254c1e05ea53937b4663faaed537b62
Merge "labs-vagrant: Fix initial clone and ownership" into production