Explicit allowance for command blacklist shouldn't be necessary in
master nor ussuri/train as per  and, more in general, shouldn't
ever be needed with "profile rbd"
It seems a problem seen when upgrading from jewel to luminous, for
tripleo that means upgrading from newton to queens; the changes are
for the jewel keyring so I think the patch should be posted for
the newton branch only
This reverts commit