New version of HDP plugin
New version of HDP plugin

Current features:
* Set up Ambari server and Ambari agents from pre-built image
* Support Ambari 2.0 / 2.1
* Password generation for management console

partially implements bp: hdp-22-support

Change-Id: I53084a83cccde52654a42911f449cc8b7d769bea

openstack/sahara-tests,esikachev/sahara-tests,openstack/sahara-tests,openstack/sahara-tests,openstack/sahara-tests,openstack/sahara-scenario,openstack/sahara-scenario,openstack/sahara-scenario,esikachev/sahara-tests,esikachev/sahara-tests