Merge 2 Stacks in blueprints/lib/cluster-stack.ts

[engel80]

2 Stacks are created by build

% cdk synth
Successfully synthesized to /cdk-eks-blueprints/blueprints/cdk.out
Supply a stack id (eks-blueprint-demo/{additional-id-by-builder}, eks-blueprint-demo) to display its template.

TODO
Merge 2 Stacks in blueprints/lib/cluster-stack.ts

https://github.com/engel80/cdk-eks-blueprints/blob/develop/blueprints/lib/cluster-stack.ts