qa_crowbarsetup: allow for testing of xen

and in theory also other hypervisors
qa_crowbarsetup: do not destory VM

after testsetup. This allows reboot test to work.
fixup! qa_crowbarsetup: do not destory VM
Adjust for cinder multi backend
Cleanup: avoid doing $(echo `seq 1 X`)
Simply remove all logical volumes for the cloud that we cleanup
Increase size of ceph disks to 11G

To compute the default weight of the disks, ceph is doing something like:

df -P -k $disk | tail -1 | awk '{ print sprintf("%.2f",$2/1073741824) }'

This gives 0.00 unless the disk is bigger than ~5.5G.

Per recommendation of storage people, just increase the default to 11G
(since journal takes 5GB).

This should fix https://bugzilla.novell.com/show_bug.cgi?id=886795 on
mkcloud.

To use smaller partitions mkcloud would need to prepare the partitions
in advance with "ceph-disk prepare" to set the partitions and journal
directories.
Use test suite from ceph team when ceph is deployed