fixed test connection for existing compute-resource.

refs #2254 - minor fixes related to host form

fixes #1988 - CRUD Actions for nested parameters for host, domain, hostgroup, os

e.g.

GET /api/domains/6/parameters
POST /api/hosts/6/parameters
PUT /api/hostgroups/6/parameters/100
DELETE /api/operatingsystems/6/parameters/100

fixes #2239 API v2 CRUD for locations and organizations and added nested loc/org

fixes #2229 add an IAM role field to a compute image.

This allows use of IAM to control access to AWS services within an instance.

fixes #2203 - add locations/organizations to subnet edit page

fixes 2228 json parsing failed

Feature: #686 - Hosts can inherit environment from hostgroup

Fixes #2199: Fix install media submit/cancel buttons when locations/orgs disabled - When locations and Organizations are disabled, the submit/cancel Buttons are not well displayed when you want to add a new medium.

Revert "ptables - displaying os_family and layout in api show and list"

This reverts commit ed315bd9449dc7fa11cf0a32ef195c1795197cc3.