ci: new osd scenarios

ci: new osd scenarios

This commit add new osd scenarios, it aims to simplify the CI setup and
brings a better coverage on the OSD scenarios.
We decided to differentiate between filestore and bluestore, thinking
ahead when filestore won't be supported anymore.
So we now have two classes of tests:

* Filestore
* Bluestore

In each of those classes we have container and non-container.
Then for each we test the following:

* collocated
* collocated dmcrypt
* non-collocated
* non-collocated dmcrypt
* auto discovery collocated
* auto discovery collocated dmcrypt

This gives us a nice coverage and also reduces the footprint on the CI.
We are now up to 4 scenarios, each containing 6 OSD VMs.

Signed-off-by: Sébastien Han <seb@redhat.com>