don't try to read hostname from guest OS

although this was a nice idea, we need the hostname before the guest is
booted, which caused #87 when the hostname was not set in the
Vagrantfile

so now we skip the ssh into the guest and we improve the default
hostname a little - basing it on PWD and slapping the configured TLD on
the end.
Merge pull request #87 from phinze/issue/87/dont-ask-guest-for-hostname

cannot bring VM up after enabling landrush