Drop libvirt from setup.py
Having an unversioned libvirt-python in setup.py started causing
problems with tox, since it uses an sdist archive as a basis for
installing teuthology in its virtualenvs. Removing it is consistent with
best practices. We'll still keep it in requirements.txt.
@@ -84,7 +84,6 @@ setup(
# a dependency but we need it anyway.
'python-neutronclient',
'prettytable',
- 'libvirt-python',
'python-dateutil',
'manhole',
'apache-libcloud',
