nuke: fix import

I think broken by f28a7ebc2c3662a8a9b8eebf09c47b6c710e4d26

Signed-off-by: Sage Weil <sage@inktank.com>
install: allow use of overrides for upgrade version

Signed-off-by: Sage Weil <sage@inktank.com>
Make nuke use its own logger

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Remove needless arg from list_locks()

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