osd: clear hb_front if it was previously non-NULL and is now NULL

If we have a real addr for hb_front for a given osd and then a new map
has the osd coming up without an hb_front, we need to clear the addr
field.

Also, improve the debug output in add_heartbeat_peer() so we can tell if
we have no connection or a connection to a blank addr.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: David Zafman <david.zafman@inktank.com>
osd/OSDMap: handle case where some new osds have hb_front and others don't

Do not assume that because at least one OSD has an hb_front addr that they
all do, or else we will end up assigning garbage here and later thinking
it is a addr (or, more precisely, != entity_addr_t()).

Fixes: #5460
Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: David Zafman <david.zafman@inktank.com>
mon/Paxos: make 'paxos trim disabled max versions' much much larger

108000 is about 3 hours if paxos is going full-bore (1 proposal/second).
That ought to be pretty safe.  Otherwise, we start trimming to soon and a
slow sync will just have to restart when it finishes.

Backport: cuttlefish
Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Joao Eduardo Luis <joao.luis@inktank.com>
mon: remove bad assert about monmap version

It is possible to start a sync when our newest monmap is 0.  Usually we see
e0 from probe, but that isn't always published as part of the very first
paxos transaction due to the way PaxosService::_active generates it's
first initial commit.

In any case, having e0 here is harmless.

Fixes: #5509
Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Joao Eduardo Luis <joao.luis@inktank.com>
Merge branch 'next'
Merge git://github.com/ceph/ceph