make sure we finish upgrade
Merge pull request #36 from aplanas/master

Remove waitinststage.
Merge pull request #35 from os-autoinst/coolo_upgrade

make sure we finish upgrade
simplify bootloader test to make it less fragile
Merge pull request #37 from os-autoinst/coolo_rewrite_bootloader

simplify bootloader test to make it less fragile
Rename waitidle to wait_idle.