A simple method to separate configuration for base fuel, plugins, PODs

A simple method to separate configuration for base fuel, plugins, PODs
and deployment/test scenarios

READY TO MERGE!

Replaces: https://gerrit.opnfv.org/gerrit/#/c/3995/

Abstract
--------
This deployment framework relies on a configuration structure,
providing base installer configuration, per POD specific configuration,
plugin configuration, and deployment scenario configuration.
- The base installer configuration resembles the least common denominator
  of all HW/POD environment and deployment scenarios (These configurations
  are normally carried by the the installer projects in this case (fuel@OPNFV).
- Per POD specific configuration specifies POD unique parameters, the POD
  parameter possible to alter is governed by the Fuel@OPNFV project.
- Plugin configuration - providing configuration of a specific plugin.
  these configurations maintain there own namespace and are normally maintained
  by collaborative projects building Fuel@OPNFV plugins
- Deployment scenario configuration - provides a high level, POD/HW environment
  independent scenario configuration for a specific deployment. It defines what
  features/plugins that shall be deployed - as well needed overrides of the
  plugin config as well as the base installer-, POD/HW environment-
  configurations. Objects allowed to override
  is governed by the Fuel@OPNFV project.

Executing a deployment
----------------------
deploy.sh must be executed locally at the target lab/pod/jumpserver
A lab configuration structure must be provided - see the section below.
It is straight forward to execute a deployment task - as an example:
sudo deploy.sh -b file:///home/jenkins/config -l ericsson-1 -p pod-2
-s os_odl-l2_no-ha -i file:///home/jenkins/MyIso.iso

-b and -i arguments should be expressed in URI style. The resources can thus be
local or remote.

Feedback
--------
Please give feed-back before I'm going to far on a wrong tangent

Implemented scenarios so far:
-----------------------------
- os_ha
- os_no-ha
- os_odl-l3_ha
- os_odl-l3_no-ha
- os_odl-l2_ha
- os_odl-l2_no-ha
- os_onos_ha
- os_onos_no-ha
- os_kvm_ha
- os_kvm_no-ha
- os_ovs_ha
- os_ovs_no-ha
- os_kvm_ovs_ha
- os_kvm_ovs_no-ha

VERIFIED
READY TO MERGE

JIRA: FUEL-35

Change-Id: I94a9b477d8ed4ee8057c16d8f20fe543f7ecc20d
Signed-off-by: Jonas Bjurel <jonas.bjurel@ericsson.com>