[Toaster] [review-request] michaelw/co/vladfulgeanu/fix_redundant_field

[Michael Wood]

Forwarding this patch from Vlad Fulgeanu which is based on top of 
*adamian/20150515_fix_table_header**
*(Could be cherry picked onto that branch?)

commit 0b37d9586ee5ef16f2250fcb920111026d201a7d
Author: Vlad Fulgeanu <andrei-vlad.fulgeanu at intel.com>
Date:   Thu Jun 4 16:59:58 2015 +0300

     bitbake: toaster: tables: Remove obsolete field_name for select column

     field_name is no longer used for this kind of column. So no need to 
specify
     it here.

     Signed-off-by: Vlad Fulgeanu <andrei-vlad.fulgeanu at intel.com>