Comment 9 for bug 1439417

Unhardcode at fuelweb_test/models/environment.py enp0s3.
Add logging.

Sample run parameters
export ENV_NAME=133
export VENV_PATH=../fuel-devops-venv
export ISO_PATH=/home/akostrikov/Images/fuel-8.0-518-2016-02-03_07-53-27.iso
export NODES_COUNT=4
export INTERFACE_ORDER='public,admin,management,private,storage'
export IFACE_0=enp0s4
export IFACE_1=enp0s3
./utils/jenkins/system_tests.sh -t test -w $(pwd) -j fuelweb_test -i $ISO_PATH -kK -o --group=deploy_neutron_vlan