Make tests invariant to LANG setting (#1462)
Make tests invariant to LANG setting (#1462)

When LANG is set to a non English locale (e.g. de_DE.UTF-8), free and
vmstat will output the text translated and cause the test cases to fail.

Therefore set LANG=C.UTF-8 when calling free or vmstat to always get the
English output.
0-wiz-0/psutil,giampaolo/psutil,0-wiz-0/psutil,giampaolo/psutil