Remove the deprecated "giturl" option
Remove the deprecated "giturl" option

From openstackdocstheme 1.18.0, valid Git URLs can be retrieved by
openstackdocstheme[1], we do not need giturl option anymore.

[1] https://review.openstack.org/532163

Change-Id: If4189b08a126f5ee8c513992487fccc08b8871dc

openstack/openstack-ansible-memcached_server,openstack/openstack-ansible-memcached_server