mon/OSDMonitor: switch primary-{affinity,temp} checks to require_min_compat_client

mon/OSDMonitor: switch primary-{affinity,temp} checks to require_min_compat_client

If require_min_compat_client is set (we've finished luminous upgrade), use
that to enforce primary_temp and primary_affinity settings.  Otherwise,
use the legacy config option.

Drop the assert in update_from_paxos.

After luminous we can remove the config options entirely.

Signed-off-by: Sage Weil <sage@redhat.com>