fix trend labels for ForemanTrends

support for passing template_kind hash as input parameter during create and update operations

fixes #2011 - Param Class optimization fails on Postges

refs #2010, fixes cache issues when selecting an org/location

fixes #2010 - selecting an org/location does not expire topbar cache

fixes #1937 - Foreman doesn't work well when run on subpath

• request_url is not enough to pass form controller to tftp
  Other variables (like script_name) need to be used from
  controller.url_options to properly generate the path in the PXE template.
• use rails helper to get the path to noVNC source...

Fix the path for create medium API

fixes #2004 - Location and Orgs are visible in the host show page even when its disable

fixes #2003 - Improve Parameterized classes values retrieval time

This patch adds a new classification class which
tries to fetch all values at once

The initial implementation cared about a name / value at a time
however getting all at once (e.g. during a puppet ENC call) is much more...

SQL improvments for paramaters in host edit section refs #2003