Run ceph-s3-tests job less
Run ceph-s3-tests job less

We don't need it for unit-test-only changes or most doc changes.

Change-Id: I803e0dc6861786db44cbcf5943032424ba319d54

tipabu/swift,tipabu/swift,tipabu/swift,openstack/swift,openstack/swift,swiftstack/swift,tipabu/swift,swiftstack/swift,openstack/swift,swiftstack/swift,openstack/swift