Since failCommand is only available on newer server versions and need a special parameter to be enabled, the configureFailPoint helper now automatically skips a test if failCommand is not available, instead of failing the test with an error.

For most tests, we only want to expose a single mongos node to avoid issues with fail points. This change parses and reassembles the connection URI to only return a single mongos node in the URI.

This fixes issues in tools like PhpStorm that are not able to show test progress when the test name changes.

Merged from $647

https://jira.mongodb.org/browse/PHPLIB-362

Note that I haven't added any `use` statements for new classes. This will be done automatically when we add `phpcs` checks in [PHPLIB-330](https://jira.mongodb.org/browse/PHPLIB-330).