osmo-gsm-tester: allow collecting statistics / KPI of a test case
the osmo-gsm-tester so far "merely" asserts success or failure of a test run.
For some setups, it would be interesting to see actual key performance indicators on the test results, included in the jenkins reports.
For example received signal strength (RSSI), the time that something took, the amount of data transmitted...
- Add an API to collect such (presumably) numbers (but keep it type agnostic?)
- pretty-print these results at the end of the test
- Include in the jenkins reports