fixes #812 - new permissions model, user group role and nest support, role filters for better granularity

• Daniel Lobato <elobatocs@gmail.com>
• Joseph Magen <jmagen@redhat.com>
• Tom McKay <thomasmckay@redhat.com>
• Greg Sutcliffe <gsutclif@redhat.com>...

fixes #4393 - rename ancestry label to title

fixes #4198 - API v2 - add child nodes to show responses. Ex. architecture should show operating systems node

fixes #4222 Add capability to compute resource API to retrieve cluster,network,storage info on oVirt

fixes #3912 - add inheritance for locations / organizations

fixes #3939 - add option to 'inherit from parent' for hostgroup attributes

fixes #4268 - don't search for host with nil IP on hostname spoofing

Fixes #4341: Adds a new organization taxonomy that is labeled empty.

fixes #2726 - smart class parameter override fails validation

fixes #3725, #4167 - root password validations, remove default password