test_nuke: add unit tests for internal nuke options
test_nuke: add unit tests for internal nuke options

Signed-off-by: Josh Durgin <1442af5e32b56bc0fa9c40ad9e4d67aeb05f1e26@redhat.com>

ktdreyer/teuthology,ceph/teuthology,ceph/teuthology,ktdreyer/teuthology