Use zookeeper to support version control of information resources for the new transport service

[fno2010]

To implement the new transport service, we need to refine the current openalto architecture to support version control of information resources.

Zookeeper is a good fit for this. In the first version, we will introduce a version control layer using zookeeper.

References:

• Zookeeper quick deployment: https://hub.docker.com/_/zookeeper
• Zookeeper python binding: https://kazoo.readthedocs.io/en/latest/basic_usage.html

[fno2010]

The operator should be able to config which diff algorithm will be used.

Some python libraries for JSON diff that may be useful:

• JSON Patch: https://python-json-patch.readthedocs.io/en/latest/tutorial.html
• JSON Merge Patch: https://github.com/OpenDataServices/json-merge-patch