Created endpoint for serving upsert requests

[samhotep]

Done

• Put all upsert requests behind /security/updates/
• The rationale here is that we don't want the security team to be blocked by intermittent resource-related issues on the main /security endpoint.
• This PR by itself doesn't create the deployment, but sets it up. The following also need to be implemented
• [x] Update Jenkins to deploy a new service for this endpoint
• [ ] Merge this PR to update the u.com ingress to direct /security/updates traffic to the new service (staging only)

QA

• Check out this feature branch
• Run the site using the command ./run serve
• View the site locally in your web browser at: http://0.0.0.0:8030/
• Test insertions

[stevebeattie]

FYI, I tested updating the current backlog of CVE data updates against the staging endpoint, and was able to update 3000+ CVEs successfully, in blocks as large as 50 CVEs at a time. While that doesn't guarantee that production will not hit issues, it would be great to land this branch as soon as possible so the Ubuntu Security team can switch over to the new endpoints.

Thanks!

[stevebeattie]

On the Ubuntu Security team side of things, I have created https://code.launchpad.net/~sbeattie/ubuntu-cve-tracker/+git/ubuntu-cve-tracker/+merge/468757 in preparation for this branch landing and being deployed. Thanks!

[samhotep]

Thanks @stevebeattie for testing the endpoint!