LU-3386 lproc: improve osc/mdc "imports" connect data

Improve /proc/fs/lustre/{osc,mdc}/*/import files to print
the struct obd_connect_data data fields as "connect_data:"
in addition to the "connect_flags:" field.

Signed-off-by: Liu Ying <emoly.liu@intel.com>
Change-Id: If37043ee05c1ab387e0762f9ecb34fbe2602afc4
Reviewed-on: http://review.whamcloud.com/6588
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>