Remove LANG=C from rootwrap invocations

For more than a decade already, systems support LC_ALL=C,
which overwrites LANG=C, so setting both is only confusing.

Change-Id: I5640b9cb747892162a856315ea7331cfea7cba5a
Merge "Remove LANG=C from rootwrap invocations"
(Test commit) Change README to reflect Jio's fork of Cinder

Change-Id: I3f26c0a736e63725aec24ca2fa12c707b8e6460f