Rename RESIZED -> SETUP_INSTALLER
Rename XAPIFIRSTBOOT -> XENSERVER_FIRSTBOOT
Rename GET_CLOUD_PARAMS -> UBUNTU
Rename XAPI -> XENSERVER
Merge pull request #50 from matelakat/rename-states

Rename states
refactor reboots

Reboot has been done by the upstart/init scripts automatically. This was
not obvious, so I'm inlining the reboots.