osdmap: convert get_blocklist() to provide the entity/IP and range blocklists

osdmap: convert get_blocklist() to provide the entity/IP and range blocklists

Providing a non-range-aware blocklist accessor would just be
asking for trouble, so don't.

The ugly part of this is how the Objecter is currently just
throwing the range blocklist on the end of its own list. The in-tree
callers are okay with this, and I'd like to look at removing the
blocklist events API from librados entirely -- it exposes "OSD-only"
state to clients and, as evidenced by this patch series, is not
particularly stable.

Signed-off-by: Greg Farnum <gfarnum@redhat.com>