core: osinfo - Rmove unassigned and streamline all ids with the REST ids.

This patch renders the uniqe os ids to be exact as the REST OsType
so there is no mapping needed at all. The effect it that every new
os added to the system immediatly is reflected with no changes in the
REST

* REST - VmMapper - the mapper now converts from the osinfo values back
* and forth. The osType enum is kept as reference for now.

* REST - capabilities - merge the osinfo values with OsType values
* osinfo.properties - rename all os uniqe ids to fit the REST ids.

* UI - static content images names relayed on the uniqe names and
* renamd accordingly

Change-Id: Ie508a8828caedf4cb8fdf971e14139404f7dded3
Bug-Url: https://bugzilla.redhat.com/980813
Signed-off-by: Roy Golan <rgolan@redhat.com>