Fix error in logs formatting
Fix error in logs formatting

TypeError: %d format: a number is required, not unicode
Logged from file dlrn_interface.py, line 257

Change-Id: I4b420320d2d925a424afe76ba88d403332638cbb

rdo-infra/ci-config,rdo-infra/ci-config,redhat-openstack/rdo-infra,redhat-openstack/rdo-infra,redhat-openstack/rdo-infra,redhat-openstack/rdo-infra,rdo-infra/ci-config,rdo-infra/ci-config