Test runner url configuration

[yanj-github]

The URL used by the Observation Framework (OF) to send test results and read configurations is configurable through the config.ini file, available here. The test_runner_url parameter is currently set to http://localhost:8000 by default. However, it does not include the web root "_wave" by default; instead, the OF automatically appends "_wave" to the URL.

To enhance flexibility, changes are required to make the web root configurable. This would allow users to specify a different web root when setting up the test runner if desired.

[yanj-github]

Tested and this is working fine.