HMI sends SDL.OnReceivedPolicyUpdate for all SystemRequest request types

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Description:

https://github.com/smartdevicelink/sdl_hmi/blob/develop/ffw/BasicCommunicationRPC.js#L597

if (request.method == 'BasicCommunication.SystemRequest') {
            if (FLAGS.ExternalPolicies === true) {
              FFW.ExternalPolicies.unpack({
                requestType: request.params.requestType,
                requestSubType: request.params.requestSubType,
                fileName: request.params.fileName
              });
            } else {
              this.OnReceivedPolicyUpdate(request.params.fileName);
            }
...

Precondition:

1. HMI and SDL are started
2. Mobile app is registered
3. App is activated

Steps to reproduce:

1. Send SystemRequest {requestType: "CLIMATE", fileName: "climateData.json"} from the mobile app

Expected result:

1. HMI sends successful BasicCommunication.SystemRequest response to SDL
2. Mobile app receives successful SystemRequest response

Actual result:

1. HMI sends successful BasicCommunication.SystemRequest response to SDL
2. HMI sends SDL.OnReceivedPolicyUpdate notification to SDL with {"policyfile":"/tmp/fs/mp/images/ivsu_cache/climateData.json"}
3. Mobile app receives successful SystemRequest response

Environment:

SDL: smartdevicelink/sdl_core@08d1240
HMI: 71cbfe9

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Closed via #561