Added strict_boot_check config paramater

### Summary
- Reverted the previous change for the None check on the networks field and made it configurable instead
- Added a scrict_boot_check configuration value to let us specify on boot 
if we should run checks if the networks field was not passed in to the api request.

### Testing
- Updated the originally modified test to verify it returns an empty string response without the check specified
- Added a new test verifying it would pass back a 403 if strict_boot_check is true with invalid networks
- Added two tests verifying strict_boot_check is false or missing that the result would not be a 403
even if the networks don't pass the tests
- Ran all tests locally with tox and verified they all passed