zuul: collect cinderlib logs from tempest node(s) only
zuul: collect cinderlib logs from tempest node(s) only

The functional tests are executed from the tempest node(s), which means
that the collection must happen from the same place, not all nodes;
otherwise the playbook code fails on pure compute nodes.

Change-Id: Ibe1796e1380add34b6d8f19606bb55fda13c3c08

mahak/cinder,mahak/cinder,openstack/cinder,openstack/cinder