virttest.utils_net_unittest: Unstub stubbed functions

They were interfering with the tests that followed.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
virttest.virsh_unittest: Fix weakref

For some reason, providing an actual dict as a dictlike
reference for Virsh doesn't work. Let's use a little
trick to provide a valid one.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
virsh.versionable_class: Fix getattr bug

If a given attribute is not on __dict__ of the original
wrapped module, just return the normal getattr behavior,
not just None. This fixes a bug that versionable_class.Manager()
was triggering in the nose unittest runner, since trying
to get versionable_class_unittest.__path__ would lead to
a None value.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
Merge pull request #1601 from autotest/fix-broken-unittests-travis

Fix broken unittests travis