Suppress query params in logs

[domdom82]

• A short explanation of the proposed change:
  As discussed in this routing-release issue I have provided logic to redact query parameters of GET requests from getting logged to the access log.

• An explanation of the use cases your change solves
  There are three options:
  none (default) retains the current behavior: All parameters are logged
  all Removes all query parameters from the log
  hash performs a SHA1 over the query parameters and logs only the hash sum.

• Instructions to functionally test the behavior change using operator interfaces (BOSH manifest, logs, curl, and metrics)

Default behavior:

1. In gorouter BOSH job set property redact_query_parameters to none
2. bosh -d cf deploy
3. curl https://some-app.cf-app.com/?password=secret
4. bosh -d cf ssh gorouter
5. vi access_log
6. The access_log should say some-app.cf-app.com - [timestamp] "GET /?password=secret HTTP/1.1"

Log no query parameters:

1. In gorouter BOSH job set property redact_query_parameters to all
2. bosh -d cf deploy
3. curl https://some-app.cf-app.com/?password=secret
4. bosh -d cf ssh gorouter
5. vi access_log
6. The access_log should say some-app.cf-app.com - [timestamp] "GET / HTTP/1.1"

Log only hash of query parameters:

1. In gorouter BOSH job set property redact_query_parameters to hash
2. bosh -d cf deploy
3. curl https://some-app.cf-app.com/?password=secret
4. bosh -d cf ssh gorouter
5. vi access_log
6. The access_log should say some-app.cf-app.com - [timestamp] "GET /?hash=878830dc19ac17a15b189cad83b7809975bc525e HTTP/1.1"

• Expected result after the change
  GET query parameters are hidden or hashed if needed.

• Current result before the change
  GET query parameters are logged.

• Links to any other associated PRs
  tbd

• I have viewed signed and have submitted the Contributor License Agreement

• I have made this pull request to the main branch

• I have run all the unit tests using scripts/run-unit-tests-in-docker from routing-release.

• (Optional) I have run Routing Acceptance Tests and Routing Smoke Tests on bosh lite

• (Optional) I have run CF Acceptance Tests on bosh lite

[ameowlia]

Released! https://github.com/cloudfoundry/routing-release/releases/tag/0.209.0