[sahara multinode] Specify empty config for subnode
- shell: |
#!/bin/bash -xe
export PYTHONUNBUFFERED=true
+ export DEVSTACK_SUBNODE_CONFIG=" "
export DEVSTACK_LOCAL_CONFIG="enable_plugin sahara git://git.openstack.org/openstack/sahara"
export DEVSTACK_LOCAL_CONFIG+=$'\n'"enable_plugin heat git://git.openstack.org/openstack/heat"
export DEVSTACK_GATE_TEMPEST=0
