Fixed /api/2.0/roles always returning empty array (#4397)
Fixed /api/2.0/roles always returning empty array (#4397)

* Fixed /api/2.0/roles always returning empty array

* Fixed API versions > 1 not returning capabilities

hbeatty/incubator-trafficcontrol,hbeatty/incubator-trafficcontrol,hbeatty/incubator-trafficcontrol,hbeatty/incubator-trafficcontrol,hbeatty/incubator-trafficcontrol,hbeatty/incubator-trafficcontrol,hbeatty/incubator-trafficcontrol,hbeatty/incubator-trafficcontrol,hbeatty/incubator-trafficcontrol,hbeatty/incubator-trafficcontrol