i#1795 CDash: change site naming convention
i#1795 CDash: change site naming convention

Changes the CDash site naming convention to a four-part sequence
Architecture.OSVersion.Compiler.Hostname.

Review-URL: https://codereview.appspot.com/272870043

AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio