Add the .stestr.conf file to networking-cisco
Add the .stestr.conf file to networking-cisco

From Queens onwards os-testr uses stestr instead of testr so we need to
have a .stestr.conf file in networking-cisco to allow that to work.

Change-Id: Ib609f15cfbb3d5d4483ff7111638d1cbd16b9ca5

noironetworks/networking-cisco,noironetworks/networking-cisco,openstack/networking-cisco,Tehsmash/networking-cisco,Tehsmash/networking-cisco,openstack/networking-cisco