Update cross browsers (BrowserStack and LambdaTest) to return session url and noted in logs

[rohandudam]

• Updated BrowserStack API server url and endpoints, now it returns correct session id and session url
• Updated Browerstack and LambdaTest runner script to return session_url along with driver
• Updated driverfactory and web and mobile helper to handle driver and session_url
• Now BrowserStack runner script returns correct session_url consistently (You can't see none session_id like in past). It works fine for both web and mobile tests.
• Made logging object file free from BrowserStack integration

[rohandudam]

The tests seems to be working fine. I'm also seeing the session URL's for both Browserstack and lambda test.

1. Something i noted is that when we run the tests in parallel , we don't have an idea of which URL belongs to what test in the console log. I think it would be better if we print the testname along with the URL self.write( "Cloud Session URL: " + '\n' + str(self.session_url))
2. is the auth_token required to be present in the URL? It enables people outside the organization to view the test runs.

1. I liked your suggestion. Will make your suggested change in upcoming PR. @akkuldn jfyi: When we run the tests in parallel, we need to check respective test log file under log directory as console log shows random logs from all test. Even we can't guess which log is from which test.
2. We decided to print public url for BrowserStack session if public_url is available. If public_url is not available or None, it will print private browser_url without auth_token. Look at get_current_session_url method under browserstack_runner.py file.