Shallow (--depth=1) clone raises some problems with git review tool.
Here is the part of the failed propose-requirements-update job logs:
+ git clone --depth=1 ssh://jenkins@review.openstack.org:29418/openstack/cinder.git
+ pushd cinder
+ git review -s
+ git review -d I2d8f240009d2f847b321baa011880f753783be83
Downloading refs/changes/69/60969/1 from gerrit into review/jenkins/openstack/requirements
fatal: unresolved deltas left after unpacking
fatal: unpack-objects failed
Change-Id: Ie69261fde73c18134906f3edd1263479830005c4