cephadm: assert that ceph specific env vars get set

cephadm: assert that ceph specific env vars get set

Assert that ceph based services set a tcmalloc related env var.
Also assert that a few assorted services do not set the env var.

Part of a series of commits to increase coverage of deployment
path features with regards to container engine options, env vars
and mounts. This will serve future refactoring efforts.

Signed-off-by: John Mulligan <jmulligan@redhat.com>