tests: switch to using key/value extra-vars instead of json
tests: switch to using key/value extra-vars instead of json

I continue to have issues with extra-vars as json. The latest issue
being that the ceph_docker_image_tag config option included in the json
was being ignored. I can't find the root cause, by using the key/value
format seems to work.

I've also removed several options here to simply the interface. We can
add those back if they become necessary.

Signed-off-by: Andrew Schoen <1bb641dc23c3a93cce4eee683bcf4b2bea7903a3@redhat.com>

bengland2/ceph-ansible,ceph/ceph-ansible,font/ceph-ansible,font/ceph-ansible,ceph/ceph-ansible,travmi/ceph-ansible,fgal/ceph-ansible,jtaleric/ceph-ansible,travmi/ceph-ansible,bengland2/ceph-ansible,jtaleric/ceph-ansible,fgal/ceph-ansible