Mongo driver 4 rc no auth defaults

[aljones15]

This was tested locally with a server with authentication on.
The following was the result:

 MONGODB_URL="mongodb://bedrock_mongodb_test-user:password@localhost:27017/bedrock_mongodb_test" npm t
{
  url: 'mongodb://bedrock_mongodb_test-user:password@localhost:27017/bedrock_mongodb_test',
  connectOptions: {
    serverSelectionTimeoutMS: 30000,
    promoteBuffers: true,
    forceServerObjectId: true,
    writeConcern: { w: 'majority', j: true }
  }
}
... test results all passed

Additionally I tested what happens if someone sets connectOptions.auth

 MONGODB_USERNAME=bedrock_mongodb_test-user MONGODB_PASSWORD=password npm t

> bedrock-mongodb-test@0.0.1-0 test
> node --preserve-symlinks test.js test

{
  url: 'mongodb://localhost:27017/bedrock_mongodb_test',
  connectOptions: {
    serverSelectionTimeoutMS: 30000,
    promoteBuffers: true,
    forceServerObjectId: true,
    auth: { username: 'bedrock_mongodb_test-user', password: 'password' },
    writeConcern: { w: 'majority', j: true }
  }
}
... all tests passing

1. Removes config.mongodb.username
2. Removes config.mongodb.password
3. Removes authn checks from connect
4. Renames ./lib/authn.js to ./lib/connect.js
5. Removes auth details from urls.create
6. Updates auth tests to use a connection string
7. Drops support for node v14 from ci actions (reduces ci action minutes used)

PR Mystery that needs to be solved:

• I was able to connect to a local auth enabled mongodb server with the options above using the auth object, but the ci tests failed which suggests there is an edge case where the auth object is failing when the authSource is not the database being connected to.

Resolves this issue, by removing auth defaults: #54

[codecov-commenter]

Codecov Report

Merging #93 (ad561c7) into mongo-driver-4-rc (1b4c0e6) will increase coverage by 2.40%.
The diff coverage is 50.00%.

@@                  Coverage Diff                  @@
##           mongo-driver-4-rc      #93      +/-   ##
=====================================================
+ Coverage              87.08%   89.48%   +2.40%     
=====================================================
  Files                      8        8              
  Lines                    813      742      -71     
=====================================================
- Hits                     708      664      -44     
+ Misses                   105       78      -27     

Impacted Files	Coverage Δ
lib/authn.js	83.72% <ø> (+6.67%)	⬆️
lib/index.js	81.85% <0.00%> (+0.71%)	⬆️
lib/test.config.js	100.00% <ø> (ø)
lib/urls.js	91.48% <ø> (+6.30%)	⬆️
lib/config.js	100.00% <100.00%> (ø)

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[dlongley]

Can you add something here that says that all of these options, if needed, must be provided via the database url config option?

[dlongley]

These comments need to be brought into sync with these changes.

[dlongley]

We don't want to support this, only url options, right?

[dlongley]

This should be removed too, right? It looks like it can be done via the url. We want there to be just one way to do these things if possible.

[dlongley]

We'll want to bring these comments in sync after removing the extra options.

[dlongley]

Closing in favor of #107.