Add last commands

[craigmulligan]

• [x] http://petstore.swagger.io/?url=http://agile-iot.github.io/agile-api-spec/docs/swagger/api.swagger.yml#!/Protocol/StopDiscovery
• [x] http://petstore.swagger.io/?url=http://agile-iot.github.io/agile-api-spec/docs/swagger/api.swagger.yml#!/Protocol/StartDiscovery

[craigmulligan]

Added but waiting on clarification: https://github.com/Agile-IoT/agile-core/issues/42