[ops-guide] Add step to accept image sharing
[ops-guide] Add step to accept image sharing

To share images between projects the member status needs to be accepted

Change-Id: I83e638aa018ddc8d35f43dfe3a45e8d2b60a6b9c
Closes-Bug: 1592845

openstack/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals