Move HAWQ Ambari plugin to Apache HAWQ

To add HAWQ and PXF to Ambari, users have to follow certain manual steps.

These manual steps include:

• Adding HAWQ and PXF metainfo.xml files (containing metadata about the service) under the stack to be installed.
• Adding repositories, where HAWQ and PXF rpms reside so that Ambari can use it during installation. This requires updating repoinfo.xml under the stack HAWQ and PXF is being added to.
• Adding repositories to an existing stack managed by Ambari requires adding the repositories using the Ambari REST endpoint.

The HAWQ Ambari plugin automates the above steps using a script.