qa/suites/rados: reduce the number of cephadm tests

qa/suites/rados: reduce the number of cephadm tests

Currently, every rados run of ~400 jobs is running ~150 cephadm tests,
which is unnecessary and redundant. With this change, we will run some
basic cephadm tests within the rados suite. The following seems to be
a good start.

qa/suites/rados/cephadm/osds
qa/suites/rados/cephadm/smoke
qa/suites/rados/cephadm/smoke-singlehost
qa/suites/rados/cephadm/workunits

Signed-off-by: Neha Ojha <nojha@redhat.com>