- add external port in yaml file
- update listener settings

- updated formats in _Collector file
- Change driver name from 'OCDriver' to 'GNMIOpenConfigCollector'

- changes collector list name from COLLECTOR to COLLECTORS
- updated __init__ method signature to remove username, password and insecure parameters as they are already exists inside the **setting parameter
- updated connect() to return bool
- updated disconnect() to return bool
- remove old comments

- updated imports
- Added logger condition to remove warning messages
- change DRIVERS with COLLECTORS

Refactor GNMI OpenConfig tests: update requirements, add new test files, and enhance existing test cases