webos: Add Ubuntu 12.04.2 LTS to SANITY_TESTED_DISTROS

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@palm.com>
Change-Id: I39321bd52052d54f4f07cca353a2d8ed9e96029f
Reviewed-on: http://g2g.palm.com/1411
Reviewed-by: Build Verification
Reviewed-by: Martin Jansa <martin.jansa@palm.com>
Tested-by: Martin Jansa <martin.jansa@palm.com>
Reviewed-by: Susan Montooth <susan.montooth@palm.com>