Commits on Nov 28, 2014

1. Event flow analysis: …

     Let us say OSD A and B are peers with each other, at certain point, B is marked down by monitor (and thus kicked off osd map), but the daemon is still there, A would mark the connection with B down and clean everything. When B is in again, it will try to connect with A and negotiate the message in/out sequence. At A side, it will receive B's in_seq and drop messages whose sequence is equal to or less than B's in_seq. In this case, A's out_seq might be inconsistent to B's in_seq.
   
   Solution:
    At A side, after receiving B's in_seq, if after locally clean-up, if its out_seq is still less than B's in_seq, bump up its out_seq to make two sides consistent with each other.
   
   Signed-off-by: Guang Yang <yguang@yahoo-inc.com>

   Guang Yang committed Nov 28, 2014
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