Add labsvagrant helper script to help manage labsvagrant roles

Is replacement for 'vagrant' command used in mediawiki/vagrant.
The script was added to mediawiki/vagrant.git in Change
If2366ee94475c54d23b12abf4eac3fe84c36b8f5

Change-Id: I955079f6d209630b5ff209a9cd695ba6ec620e3f
Merge "Add labsvagrant helper script to help manage labsvagrant roles" into production