python-devops fails to resume virtualbox vm if it is already running

[Eugene Korekin]

Attempt to resume already running vm on kvm hypervisor with libvirt result in success.
But if hypervisor type is virtualbox libvirt raises exception:

======================================================================
ERROR: Deploy cluster with controller node only
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Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/proboscis/case.py", line 296, in testng_method_mistake_capture_func
    compatability.capture_type_error(s_func)
  File "/usr/lib/python2.7/dist-packages/proboscis/compatability/exceptions_2_6.py", line 27, in capture_type_error
    func()
  File "/usr/lib/python2.7/dist-packages/proboscis/case.py", line 350, in func
    func(test_case.state.get_state())
  File "/home/jenkins/fuel-main/fuelweb_test/helpers/decorators.py", line 52, in wrapper
    return func(*args, **kwagrs)
  File "/home/jenkins/fuel-main/fuelweb_test/tests/test_vcenter.py", line 44, in vcenter_one_node_simple
    self.env.revert_snapshot("ready_with_1_slaves")
  File "/home/jenkins/fuel-main/fuelweb_test/models/environment.py", line 345, in revert_snapshot
    self.get_virtual_environment().resume()
  File "/home/jenkins/venv-nailgun-tests/local/lib/python2.7/site-packages/devops/models.py", line 134, in resume
    node.resume(verbose)
  File "/home/jenkins/venv-nailgun-tests/local/lib/python2.7/site-packages/devops/models.py", line 347, in resume
    self.driver.node_resume(self)
  File "/home/jenkins/venv-nailgun-tests/local/lib/python2.7/site-packages/devops/helpers/retry.py", line 27, in wrapper
    return func(*args, **kwargs)
  File "/home/jenkins/venv-nailgun-tests/local/lib/python2.7/site-packages/devops/driver/libvirt/libvirt_driver.py", line 330, in node_resume
    self.conn.lookupByUUIDString(node.uuid).resume()
  File "/usr/lib/python2.7/dist-packages/libvirt.py", line 1784, in resume
    if ret == -1: raise libvirtError ('virDomainResume() failed', dom=self)
libvirtError: operation failed: machine not paused, so can't resume it

I propose to check if VM is in paused state before resuming.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/126619

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/126619
Committed: https://git.openstack.org/cgit/stackforge/fuel-devops/commit/?id=37794d367d36ed147c3c9ea89bc594ccb345fe61
Submitter: Jenkins
Branch: master

commit 37794d367d36ed147c3c9ea89bc594ccb345fe61
Author: Eugene Korekin <email address hidden>
Date: Tue Oct 7 20:37:15 2014 +0400

    Workaround for virtualbox domain resuming

    Change-Id: I0675f0ab7a82d4928aa44427250ddb1f0c7d85c2
    Closes-Bug: #1376791