Use Case

As a... Node Driver user
I want... MongoClient.close to always close monitoring connections (even if close fails otherwise)
So that... monitoring connections are consistently closed and don't end up leaking

User Experience

• `MongoClient.close` closes the monitoring connections, even if other parts of `close` fails
• users right now can workaround by calling MongoClient.close twice on the client

Dependencies

• none

Risks/Unknowns

• none

Acceptance Criteria

Implementation Requirements

• MongoClient.close closes monitoring connections, even in cases when `close` itself throws an exception

Testing Requirements

• add unit tests to cover this scenario

Documentation Requirements

• none

Follow Up Requirements

• none