LU-5848 lnet: fix inconsistent seq_no names

LU-5848 lnet: fix inconsistent seq_no names

When YAML output is printed the literal "seqno" is used,
when it's parsed, the literal "seq_no" is expected.
This patch makes it consistent.

Signed-off-by: Amir Shehata <amir.shehata@intel.com>
Change-Id: Iabf5394e858007c7f6e87c7baf892887da88f8e3
Reviewed-on: http://review.whamcloud.com/12562
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Doug Oucharek <doug.s.oucharek@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>