This commit ports the following changes from v0.11:
- 9991b29 - Implement DisconnectSession API for RADIUS Agent
- 02c8ed1 - Implement support for RADIUS CoA
- 7129d34 - Merge CoA into ReAuthorize logic
- d8ad760 - Update both ReAuthorize API signatures
- 5560608 - Dynamic templates for Radius CoA out of APIOpts
- f9d1c0f - Refactor ReAuthorize to AlterSessions
- 8388832 - Rename agents API object: SessionSv1 to AgentV1
- b580e09 - Add sanity checks for radius templates
- ca6a944 - Update client_da_addresses structure
- 98265a1 - Refactor function names and error msgs related to AlterSessions
- ee98dbe - Update AgentV1DisconnectSession api signature
- c9b6c1f - Add support for sending *dmr template via APIOpts
- 03eff44 - Cache RADIUS packets during accounting instead of auth
- 28e53ce - Add requests_cache_key field to radagent cfg
