Allow omaha, board fetch from u-boot

omahaserverip, cros_board will override
respective install settings.

BUG=chrome-os-partner:4606
TEST=manual test w/ modified cmdline

Change-Id: I5cf5aff0fa6ca7cc3c4778b9222e05046f34fea9
Reviewed-on: http://gerrit.chromium.org/gerrit/4301
Reviewed-by: Nick Sanders <nsanders@chromium.org>
Tested-by: Nick Sanders <nsanders@chromium.org>
1 file changed