Honor the --local switch in the downstream driver
Honor the --local switch in the downstream driver

When using the downstream driver, the --local switch was ignored, and
the information received from the upstream versions.csv file was
always used to determine the commit to build.

This change fixes that, and allows us to use --local with the
downstream driver.

Change-Id: Ie3e5065de623ed0b0b66d75edef019e26dbf7bc8

openstack-packages/delorean,openstack-packages/delorean,openstack-packages/DLRN,openstack-packages/DLRN