mon/PGMonitor: use accessors for main pg_map fields

Signed-off-by: Sage Weil <sage@inktank.com>
mon/PaxosService: allow paxos service writes while paxos is updating

In commit f985de28f86675e974ac7842a49922a35fe24c6c I mistakenly made
is_writeable() false while paxos was updating due to a misread of
Paxos::propose_new_value() (I didn't see that it would queue).
This is problematic because it narrows the window during which each service
is writeable for no reason.

Allow service to be writeable both when paxos is active and updating.

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