error in fuel-devops 3.0.3

[vnaumov]

fuel-devops 3.0.3

failed on step "dos.py sync"
++ dos.py sync
Traceback (most recent call last):
  File "/home/jenkins/90-venv/bin/dos.py", line 22, in <module>
    shell.main()
  File "/home/jenkins/90-venv/local/lib/python2.7/site-packages/devops/shell.py", line 523, in main
    shell.execute()
  File "/home/jenkins/90-venv/local/lib/python2.7/site-packages/devops/shell.py", line 47, in execute
    command_method()
  File "/home/jenkins/90-venv/local/lib/python2.7/site-packages/devops/shell.py", line 104, in do_sync
    self.client.synchronize_all()
  File "/home/jenkins/90-venv/local/lib/python2.7/site-packages/devops/client/client.py", line 38, in synchronize_all
    models.Environment.synchronize_all()
  File "/home/jenkins/90-venv/local/lib/python2.7/site-packages/devops/models/environment.py", line 243, in synchronize_all
    driver = cls.get_driver()
AttributeError: type object 'Environment' has no attribute 'get_driver'

[Ruslan Khozinov (rkhozinov)]

devops/tests/test_shell.py::TestShell::test_sync PASSED test for sync has passed,
but real run of dos.py sync still give the same trace.

In devops-2.9 get_driver method was defined in base model.
Now the get_driver method is undefined.