Remove unneeded DLRN_DEV and REPO_BOOTSTRAP env vars
Remove unneeded DLRN_DEV and REPO_BOOTSTRAP env vars

Those environment variables were used by the build_rpm_wrapper.sh
script, which is now integrated as Python code. Thus, they are not
needed anymore.

Change-Id: Ia6d7f1ee2cc05c705ff920494f95018c6d330689

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