calamari-agent: incorporate overrides

Signed-off-by: Dan Mick <dan.mick@inktank.com>
calamari-restapi: bring up with changes as in other tasks

Signed-off-by: Dan Mick <dan.mick@inktank.com>
Factor out "roles_to_remotes()" into common code

Signed-off-by: Dan Mick <dan.mick@inktank.com>
Merge branch 'wip-teuth-calamari-wusui' of github.com:ceph/teuthology into wip-teuth-calamari-wusui