oschecks/utils: update novaclient to use 2.1 version
oschecks/utils: update novaclient to use 2.1 version

Make sure we use the latest version of novaclient when testing nova-api.

Change-Id: Ic277d97d87c7d8460c8a05e8a7898b8cc9007ff5

openstack/osops-tools-monitoring,openstack/osops-tools-monitoring,openstack/osops-tools-monitoring