Increase the amount of maximum database connections to at least 1000

When using the Operator to deploy databases for Quay and Clair the amount of database connections must be drastically increased from the default value of 100. Both workloads are heavily threaded and exceed the default connection limit very soon, especially since by default both workloads are autoscaled.

In absence of more clever adjustment of database connection pool size on the database size, we should default to a reasonable large value that can accomodate the upper scale limit of our default HorizontalPodAutoscalers.

Alternatively we have a rule of thumb computation of how many connections can be created at max by a Quay pod that has 4vCPU and 8GB RAM allocated.