Update Ambari Repo location and services refactoring

This commit is the first commit in a series of commits required to
update the plugin to support HDP 2.0.  This commit:

1)  Updates the repository to point to the lastest ambari repo
2)  Refactors the services processing in the plugin to align it
    with the version it supports

partially implements blueprint hdp-hdp2-support
Closes-Bug: #1271677

Change-Id: Ie4dc6bb61352e7a69fabe0f2efeed86e715fdd44
Merge "Update Ambari Repo location and services refactoring"