Use os_type instead of vm_type. Add os_version

Use os_type instead of vm_type for more generic naming
for when we start re-imaging bare metal. Also added a
os_version dictionary for default versions of distros
that we want over-riding what downburst defaults are.

Signed-off-by: Sandon Van Ness <sandon@inktank.com>
Wait a little longer before recreating VMs

Just to allow for the create to still work incase the os
volume is fairly large (takes a while to resize) and in
case the host machine is bogged down due to disk I/O.

Signed-off-by: Sandon Van Ness <sandon@inktank.com>
Add distro type to schedule_suite.sh

Also added machinetype to the name.

Signed-off-by: Sandon Van Ness <sandon@inktank.com>
Re-create guest if it already exists

In some cases tests fail or nuke fails and the guest is
not properly destroyed. This will look to see if it gets
an error due to the guest already existing or its disks
existing and will re-create the guest.

Signed-off-by: Sandon Van Ness <sandon@inktank.com>