Set LC_ALL=C into dib-run-parts env

Force LC_ALL to C to allow printf to work independently
from the locale. Gives invalid number error if run in non-english
locale.

Change-Id: Ia68853505485fefbf0890313456e7edb6097666b
Closes-Bug: #1335932
Merge "Set LC_ALL=C into dib-run-parts env"