template_to_instance: Fix attribute errors.

Adds a hypervisor field to the template model, and corrects the misuse of the
start field as well.

refs #16149
check_quota_modify: Fix key error

refs #16149
ganeti_web: Only update caches after app migration has run

Updates refresh_objects() in the ganeti_web app, so that it checks which app is
currently migrating, rather than just if the ganeti_web migration is finished.
This prevents running refreshes on objects which currently have migrations to
still run.

refs #16185
Postmigrate: Check for verbosity. Update south version.

refs #16185
Merge branch 'bug/16185' into develop

* bug/16185:
  Postmigrate: Check for verbosity. Update south version.
  ganeti_web: Only update caches after app migration has run
Merge branch 'bug/16149' into develop

* bug/16149:
  check_quota_modify: Fix key error
  template_to_instance: Fix attribute errors.
Virtual Machines: Adds notes field

refs #9261
Remove notes field from rapi_dict

Prevents sending an unknown field over the RAPI

refs #9261
Merge branch 'feature/9261' into develop

* feature/9261:
  Remove notes field from rapi_dict
  Virtual Machines: Adds notes field