osd: Check range_blocklist in is_blocklisted(): we actually blocklist ranges

osd: Check range_blocklist in is_blocklisted(): we actually blocklist ranges

Carry a parallel map from cidr addresses to a new
range_bits class (stored entirely as ephemeral state) so that we
don't need to re-compute masks and bit mappings too often, and to
separate out the unpleasant ipv6 bit mapping logic. Then check
against those with range_bits::matches() the same way we check
for equality on specific-entity matches. Nice and simple loops!

Fixes: https://tracker.ceph.com/issues/53050
Signed-off-by: Greg Farnum <gfarnum@redhat.com>