inform_shopfloor.sh: use sh instead of bash

BUG=chromium:544021
TEST=Run in-place wipe in Paine

Change-Id: Ib490ff89560bc6128811d0b1c7be2a0d0d3840ce
Reviewed-on: https://chromium-review.googlesource.com/311904
Commit-Ready: Shun-Hsing Ou <[email protected]>
Tested-by: Shun-Hsing Ou <[email protected]>
Reviewed-by: Bowgo Tsai <[email protected]>
1 file changed