Drop devstack-platform-opensuse-tumbleweed
Drop devstack-platform-opensuse-tumbleweed

Builds of opensuse-tumbleweed nodes are currently failing, so these jobs
are receiving NODE_FAILURE.

Change-Id: I3c2d73a150df009e7dadc76277be36eb72e0dfa7

openstack-dev/devstack,group-policy/devstack,noironetworks/devstack,nawawi/openstack,dtroyer/devstack,dtroyer/devstack,nawawi/openstack,group-policy/devstack,noironetworks/devstack,openstack-dev/devstack