Switch module for Juniper EX2200 and EX4200

- Corrects the setAdminStatus method of the Juniper module
- Adds VoIP support for 2200 and 4200
- Adds RADIUS deauthentication for 2200 and 4200
- Adds Juniper VoIP configuration to PacketFence_Network_Devices_Configuration_Guide.asciidoc