LU-7543 obd: reserve connection flag OBD_CONNECT_OBDOPACK

LU-7543 obd: reserve connection flag OBD_CONNECT_OBDOPACK

The connection flag OBD_CONNECT_OBDOPACK will be used for the
following the patch: LU-4215 optimize OUT protocol
http://review.whamcloud.com/15336

Land the connection flags to master earlier for reserving the
slot to avoid potential conflict with others.

Signed-off-by: Fan Yong <fan.yong@intel.com>
Change-Id: I75171f5e9095d40481b4462de74c6a63e1cf3084
Reviewed-on: http://review.whamcloud.com/17645
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Patrick Farrell <paf@cray.com>
Tested-by: Maloo <hpdd-maloo@intel.com>