cloudkitty service depends on pankoclient's code

[caoyuan]

When cloudkitty use panko as collect, it need pankoclient installed

017-04-19 14:50:45.810 7 ERROR cloudkitty File "/var/lib/kolla/venv/lib/python2.7/site-packages/stevedore/named.py", line 158, in _load_one_plugin
2017-04-19 14:50:45.810 7 ERROR cloudkitty verify_requirements,
2017-04-19 14:50:45.810 7 ERROR cloudkitty File "/var/lib/kolla/venv/lib/python2.7/site-packages/stevedore/extension.py", line 214, in _load_one_plugin
2017-04-19 14:50:45.810 7 ERROR cloudkitty plugin = ep.resolve()
2017-04-19 14:50:45.810 7 ERROR cloudkitty File "/var/lib/kolla/venv/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2308, in resolve
2017-04-19 14:50:45.810 7 ERROR cloudkitty module = __import__(self.module_name, fromlist=['__name__'], level=0)
2017-04-19 14:50:45.810 7 ERROR cloudkitty File "/var/lib/kolla/venv/lib/python2.7/site-packages/cloudkitty/collector/panko.py", line 22, in <module>
2017-04-19 14:50:45.810 7 ERROR cloudkitty from pankoclient import client as pclient
2017-04-19 14:50:45.810 7 ERROR cloudkitty ImportError: No module named pankoclient

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/458024

[OpenStack Infra (hudson-openstack)]

Change abandoned by caoyuan ([e-mail]) on branch: master
Review: https://review.openstack.org/458024