Test Harness (onvif-device) should have feature to record and replay responses

[zebity]

** Issue **

Currently test harness (onvif-device) requires that you code the "fake" device responses.

This is not scalable.

Need to change it so that there is way to record responses from real ONVIF devices (this could be done via proxy-relay record feature) and the plays these back via the test harness.

Recorded responses should just be JSON serialization dumps.

** Expectation **

To be able to have full scripted play (of onvif requests) which get recorded for later use by test harness.

Test harness need to "adjust some responses which have time related response.