tests still fail when libvirt not installed

[Phil Day]

https://review.openstack.org/#/c/60052/1 fixed a problem with fake libvirt driver by adding default arguments to Connection class, but the tests still fail sometimes because the default value for uri is only accepted if a global in the fake driver is true:

 allow_default_uri_connection

Tests only fail sometimes, so I guess this global is affected by other tests

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/60586

[Bhuvan Arumugam (bhuvan)]

The libvirt.allow_default_uri_connection is set False in one of test, but it is not set back to True. The above test fail when it was executed after that one.

The fix is to set this value to True after the test test_openAuth_can_refuse_None_uri is executed in nova/tests/virt/libvirt/test_fakelibvirt.py

The attached patch might solve this issue.

[Phil Day (philip-day)]

Was a duplicate of https://bugs.launchpad.net/nova/+bug/1258553, for which a fix has been committed