A handful of upgrade fixes:

* More swift fixes
* Need to set default compute driver
* Add rpc to upgrade_glance
Use folsom-era cirros image for testing
Update docs
Add clean.sh

clean.sh gets rid of all residue of running Grenade (except installed
packages and pip modules).

Check that, it eradicates rabbitmq-server (and erlang dependencies)
and mysql-server.
Save ebtables/iptables state
Wait for javelin instance to start