Users don't read READMEs or documentation, they'll
just fire 'vagrant up'. Vagrant already checks the
Virtualbox version itself, but for the Vagrant version
no checks exist. Vagrant 1.4 provides a method 'require_version'
which is pretty useless for older versions, like on Debian
Wheezy (1.0.3). So we'll ship our own version comparison.
fixes#6366
User apache and group apache is only available after provisioning.
Mounting shared folders happens before. Thus :owner and :group
settings removed.
refs #4231