PUBAPI-595: If an image has tags, expose them for API version 7.0+
PUBAPI-595: If an image has tags, expose them for API version 7.0+

joyent/sdc-cloudapi,KrisShannon/sdc-cloudapi,misterbisson/sdc-cloudapi,joyent/sdc-cloudapi,arekinath/sdc-cloudapi,arekinath/sdc-cloudapi,misterbisson/sdc-cloudapi,KrisShannon/sdc-cloudapi