Request should use this.parent not this.connection

[dhensby]

What this does:

Yikes - I did some debugging related to #1292 and it was clear that the checks we are doing are not very sensible.

1. Give request.stream and request.arrayRowMode default values of null
2. Only change the value of the specific request instance's stream or arrayRowMode prop if it's supplied by the parent config.
3. Replace usage of the non-existent this.connection with this.parent for Request instances 🤦‍♂️

Related issues:

#1292

Pre/Post merge checklist:

• Update change log