tun_5_ctrl_ceph_ephemeral test failed trying to update public network cidr with list index out of range

[Andrey Sledzinskiy]

Steps:
1. Run fuel-qa tests with group tun_5_ctrl_ceph_ephemeral

Expected - test passed
Actual - test failed on updating public cidr
https://github.com/openstack/fuel-qa/blob/master/fuelweb_test/tests/tests_deployments/tests_neutron_tun/test_ha_tun_group_3.py#L202

Traceback (most recent call last):
  File "/usr/lib/python2.7/unittest/case.py", line 331, in run
    testMethod()
  File "/usr/lib/python2.7/unittest/case.py", line 1043, in runTest
    self._testFunc()
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/proboscis/case.py", line 296, in testng_method_mistake_capture_func
    compatability.capture_type_error(s_func)
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/proboscis/compatability/exceptions_2_6.py", line 27, in capture_type_error
    func()
  File "/home/jenkins/venv-nailgun-tests-2.9/local/lib/python2.7/site-packages/proboscis/case.py", line 350, in func
    func(test_case.state.get_state())
  File "/home/jenkins/workspace/9.0.acceptance.ubuntu.ha_tun_group_3/fuelweb_test/helpers/decorators.py", line 119, in wrapper
    result = func(*args, **kwargs)
  File "/home/jenkins/workspace/9.0.acceptance.ubuntu.ha_tun_group_3/fuelweb_test/tests/tests_deployments/tests_neutron_tun/test_ha_tun_group_3.py", line 196, in tun_5_ctrl_ceph_ephemeral
    self.fuel_web.update_network_cidr(cluster_id, 'public')
  File "/home/jenkins/workspace/9.0.acceptance.ubuntu.ha_tun_group_3/fuelweb_test/__init__.py", line 59, in wrapped
    result = func(*args, **kwargs)
  File "/home/jenkins/workspace/9.0.acceptance.ubuntu.ha_tun_group_3/fuelweb_test/models/fuel_web_client.py", line 2646, in update_network_cidr
    new_cidr = list(old_cidr.subnet(1))[0]
IndexError: list index out of range

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/307636

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/mitaka
Review: https://review.openstack.org/308154

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/307636
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=e3d38cef19bbebee8e2a3ccb311a60bc1b6ad17c
Submitter: Jenkins
Branch: master

commit e3d38cef19bbebee8e2a3ccb311a60bc1b6ad17c
Author: Volodymyr Shypyguzov <email address hidden>
Date: Tue Apr 19 11:30:20 2016 +0300

    Fix update_network_cidr method

    subnet() method of netaddr.IPNetwork expects size of subnets to be returned
    so we should pass to it subnet of the smaller size, not 1

    Change-Id: Id6b7e8e43419d224cc1c3202ffd253664245d5d4
    Closes-Bug: #1571543

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/308154
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=16a176232e5d465e3211a2a7bc48b2e87dd51c57
Submitter: Jenkins
Branch: stable/mitaka

commit 16a176232e5d465e3211a2a7bc48b2e87dd51c57
Author: Volodymyr Shypyguzov <email address hidden>
Date: Tue Apr 19 11:30:20 2016 +0300

    Fix update_network_cidr method

    subnet() method of netaddr.IPNetwork expects size of subnets to be returned
    so we should pass to it subnet of the smaller size, not 1

    Change-Id: Id6b7e8e43419d224cc1c3202ffd253664245d5d4
    Closes-Bug: #1571543

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/309295

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/309295
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=e35c3d8a9b6615f2a08e4db37f3af3283e9b2c58
Submitter: Jenkins
Branch: master

commit e35c3d8a9b6615f2a08e4db37f3af3283e9b2c58
Author: Volodymyr Shypyguzov <email address hidden>
Date: Fri Apr 22 10:25:13 2016 +0300

    Use prefixlen instead of parsing it from string

    +use builtin prefixlen method instead of parsing it from string

    Change-Id: I30f49e2c22ca6bdc5334848061054c6d8ac4fd51
    Related-bug: #1571543

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/8.0
Review: https://review.openstack.org/344770

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/344770
Committed: https://git.openstack.org/cgit/openstack/fuel-qa/commit/?id=2fc4fcab0a42b6074fddc648cae6973bdc7c361f
Submitter: Jenkins
Branch: stable/8.0

commit 2fc4fcab0a42b6074fddc648cae6973bdc7c361f
Author: Volodymyr Shypyguzov <email address hidden>
Date: Tue Apr 19 11:30:20 2016 +0300

    Fix update_network_cidr method

    subnet() method of netaddr.IPNetwork expects size of subnets to be returned
    so we should pass to it subnet of the smaller size, not 1

    Change-Id: Id6b7e8e43419d224cc1c3202ffd253664245d5d4
    Closes-Bug: #1571543

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/6.1
Review: https://review.openstack.org/347286

[OpenStack Infra (hudson-openstack)]

Change abandoned by Vladimir Jigulin (<email address hidden>) on branch: stable/6.1
Review: https://review.openstack.org/347286
Reason: https://review.openstack.org/#/c/343296 cover this situation