crowbar-prep.sh: Invoke parse_opts before init_variables

This is necessary so that $CLOUD_VERSION is correctly propagated when
it's specified on the command line (otherwise it's always '3').
crowbar-prep.sh: Add comment explaining last commit
qa_crowbarsetup: sdn is now on VLAN 400
mkcloud: fix github raw urls
mkcloud: make sshrun function more readable
mkcloud: switch wget to curl due to certificate issue with github
mkcloud: fix calls of crowbar-backup script
Add libvirt group to root user
chroot-unittest: cleanup the logs for each new unit test
qualify references to SP3 updates for clarity
mkcloud: better error handling concerning crowbar backup tarball
mkcloud: fix checks in crowbar restore
ordering tweaks

It makes things more legible if we order in layers, starting with the
base OS, then the products after.
avoid a tiny bit of duplication
ensure Devel:Cloud:Shared:11-SP3:Update repo is mounted
add Cloud Updates repo
support susecloud4
Merge pull request #36 from tserong/master

crowbar-prep.sh: Invoke parse_opts before init_variables
qa_crowbarsetup: use HA with cloud3+
mkcloud: move mac address computation