LU-3456 ptlrpc: quiet errors on initial connection

LU-3456 ptlrpc: quiet errors on initial connection

It may be that a client or MDS is trying to connect to a target (OST
or peer MDT) before that target is finished setup.  Rather than
spamming the console logs during initial connection, only print a
console error message if there are repeated failures trying to
connect to the target, which may indicate an error on that node.

Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Bobi Jam <bobijam.xu@intel.com>
Change-Id: I98ec7b4c2109b700b53297038d3fede4773ebbe5
Reviewed-on: http://review.whamcloud.com/10057
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bobi Jam <bobijam@gmail.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>