refactor concrete configs out of openeo-aggregator

[soxofaan]

As we're starting to play with multiple aggregator instances, it's confusing to have the original concrete (openeo platform) configs still hardcoded in this repo. It's probably better to refactor them out.
(would also help with #94)

[soxofaan]

related to https://github.com/eu-cdse/openeo-cdse-infra/issues/22

[soxofaan]

I tried to work with more explicit env vars for clarity (replace ENV with OPENEO_AGGREGATOR_CONFIG), e.g. here:

openeo-aggregator/Jenkinsfile

Lines 15 to 16 in d057d00

	docker_run_options_dev = ['-e OPENEO_AGGREGATOR_CONFIG=/home/openeo/aggregator/conf/aggregator.dev.py', '-p 8081:8080']
	docker_run_options_prod = ['-e OPENEO_AGGREGATOR_CONFIG=/home/openeo/aggregator/conf/aggregator.prod.py', '-p 8081:8080']

but after a lot of head scratching I suspect these "docker_run_options" don't do anything anymore, the real env settings are now in puptap/hiera-resenv repo, as far as I understand

[soxofaan]

started with new project openeo-platform-aggregator on VITO bitbucket

[soxofaan]

Also to take into account here: https://github.com/Open-EO/openeo-aggregator/tree/master/integration-tests is currently openeo.cloud oriented as well. Make it more reusable or split off to standalone project?