osdc/Objecter: do not resend PING messages

On reconnect we will send a fresh reconnect.  Old pings will have no
benefit.

Signed-off-by: Sage Weil <sage@redhat.com>
osdc/Objecter: skip ping if PAUSERD

Signed-off-by: Sage Weil <sage@redhat.com>
osdc/Objecter: factor out _send_op_account()

Signed-off-by: Sage Weil <sage@redhat.com>
osdc/Objecter: fix tick() session locking

We need to take the session read lock before traversing the ops lists.

Fixes: #9706
Signed-off-by: Sage Weil <sage@redhat.com>
fix send ping now that lockign is different