system_tests.sh trying to remove env without existence check

[Alexander Charykov]

Because of this error we have such errors in our logs:

+ dos.py erase 5.1_fuelmain.system_test.ubuntu.services_simple_system_test
Traceback (most recent call last):
  File "/home/jenkins/venv-nailgun-tests/bin/dos.py", line 22, in <module>
    Shell().execute()
  File "/home/jenkins/venv-nailgun-tests/local/lib/python2.7/site-packages/devops/shell.py", line 28, in execute
    self.commands.get(self.params.command)(self)
  File "/home/jenkins/venv-nailgun-tests/local/lib/python2.7/site-packages/devops/shell.py", line 49, in do_erase
    self.manager.environment_get(self.params.name).erase()
  File "/home/jenkins/venv-nailgun-tests/local/lib/python2.7/site-packages/devops/manager.py", line 56, in environment_get
    return Environment.objects.get(name=name)
  File "/home/jenkins/venv-nailgun-tests/local/lib/python2.7/site-packages/django/db/models/manager.py", line 151, in get
    return self.get_queryset().get(*args, **kwargs)
  File "/home/jenkins/venv-nailgun-tests/local/lib/python2.7/site-packages/django/db/models/query.py", line 310, in get
    self.model._meta.object_name)
devops.models.DoesNotExist: Environment matching query does not exist.

We need to add simple check if enviroment exists and not try to remove non-existing enviroment.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/122683

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/122683
Committed: https://git.openstack.org/cgit/stackforge/fuel-main/commit/?id=ecc028189ca419a95643c38eec5576341760a311
Submitter: Jenkins
Branch: master

commit ecc028189ca419a95643c38eec5576341760a311
Author: Alexander Charykov <email address hidden>
Date: Fri Sep 19 13:12:56 2014 +0400

    Add additional check of existence of environment before erasing it

    Change-Id: I0f73e8e064d13b1dbacc19c7bfad6a1a0b0d80e1
    Closes-Bug: #1371496