This patch is based on [1] and adds following scenarios:
GnocchiArchivePolicy.list_archive_policy
GnocchiArchivePolicy.create_archive_policy
GnocchiArchivePolicy.create_delete_archive_policy
[1] https://review.openstack.org/#/c/453861/
Change-Id: If9c0d0004b7ebb9f4eed49edfd2802884d18534f
Signed-off-by: Juha Kosonen <juha.kosonen@nokia.com>