Remove unused function

Romove unused function stub_out_rate_limiting in
cinder/tests/api/fakes.py

Change-Id: Ib6fea599eacb140108ca4293cdd089b010a8b979
Closes-Bug: #1282098
Merge "Remove unused function"
(Test commit) Change README to reflect Jio's fork of Cinder

Change-Id: I3f26c0a736e63725aec24ca2fa12c707b8e6460f