Prior to this commit, the hostname was set with one big bash script and
attempted to determine what tools are available. This commit changes
that by splitting out that tool check on the Vagrant side of things with
the GuestInspection class, and adds back restarting networking to get a
DHCP lease with the change rather than using `dhclient`. This pattern
matches how hostnames are set in the redhat capability.
0c5d55e69c