Add uri_v3 to tempest config

Change-Id: I86ec0f8cec01e1f9c6065322ca98c7654fe54e86
epel=y when redhat or centos

Change-Id: I8d5c657b00cc30cd7b0bc33578760c54e661ee10
Refactor and simplify bash scripts

Simplifies run.sh by
- moving all common methods to functions.bash
- sharing the generate_settings_file function between run and
  generate-settings-file.sh
- making setting.sh into a script

Change-Id: I33ede728b64dda503a4235861987f28c5c503722
packstack/neutron: add ml2-plugin role

Change-Id: I2789169304e3badfa59fb43ca23f5e646c2a1bb2
packstack/multinode: enable ml2-plugin if tag is set

Change-Id: Ied18a7e91e9394bd7c6070bd5e5cf027df9f6200
fix: cleanup.sh: include functions.bash

Change-Id: I33876392b3ff2e0c5df510e6c8460c9f3903e402