* Rename old task statuses to the new one
"verifying" to "validating", "failed" to "crashed"
* Change the type of the status field from
the enum to the string in Task and SubTask models
Co-Authored-By: Boris Pavlovic <boris@pavlovic.me>
Co-Authored-By: Roman Vasilets <rvasilets@mirantis.com>
Change-Id: I3071bd42d9096cb14e6a3c228e1c8dfec81e9c12