123 - PV/Radar - Create role Radar group admin

Add a "radaradmin" in business, same as "unitadmin" logic.
"superadmin" is able to manage Radar group.
Merge remote-tracking branch 'robworth/develop' into features/123-PV/Radar-Create-role-Radar-group-admin
Merge pull request #58 from lu-yang/features/123-PV/Radar-Create-role-Radar-group-admin

Features/123 pv/radar create role radar group admin