This commit contains only full file deletions, and the relocation of
nuke.actions.clear_firewall() to nuke/__init__.py to retain compatibility with
older ceph.git tasks.

Signed-off-by: Zack Cerza <zack@redhat.com>

This commit contains trivial changes like reference removals, docs changes, and
removal of dead code.

Signed-off-by: Zack Cerza <zack@redhat.com>

This commit re-implements functionality that was removed with the nuke system.

Signed-off-by: Zack Cerza <zack@redhat.com>

This replaces teuthology-nuke --stale

Signed-off-by: Zack Cerza <zack@redhat.com>

docker-compose exits non-zero if a container goes down while it's running.

Signed-off-by: Zack Cerza <zack@redhat.com>