Correlate py traces and logs

[stanleegoodspeed]

Description

This updates the ads and discount service to correlate traces + logs

https://datadoghq.atlassian.net/browse/WEB-3412

How to test

1. Pull down branch locally
2. Build fresh versions of ads and discounts by running docker-compose build ads discounts --no-cache
3. Double check you have a local .env file at the root (follow instructions in README if you dont)
4. Start app via docker-compose up
5. Hit http://localhost a few times in your browser to generate logs
6. Open up DD, view logs for ads and discounts, click a log, verify that traces are populating in the context window

It should look like this

[stephen-w-pracy]

Works great! Thanks.