Pcloud support

depends of patches:
novaclient: https://review.openstack.org/#/c/38158/
nova : https://review.openstack.org/#/c/38156/

Change-Id: I620f6317b25af165cd755ad4bac87abdc14aee30
Merge remote-tracking branch 'my/pcloud' into pcloud

Conflicts:
	climate/utils/openstack/pcloud.py
	tests/test_pcloud.py

Change-Id: Ib8a999d347189bef47f2f809c8c6d945f8e265d5