Don't use zuul-cloner when running in zuulv3
Don't use zuul-cloner when running in zuulv3

Currently, run_tests.sh is using zuul-cloner to clone
distgits when running in distgits gate. Now, we can rely
on the clones created by zuulv3.

Change-Id: I89d5d5f9da88fdd78babb30ab591ce1bd3730132

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