Add apidiscovery_definitions.json to docker image

[tomplus]

This new file apidiscovery_definitions.json, with the API Discovery definitions, has to be added to allow generating clients from the docker image.

Now it crashes:

Traceback (most recent call last):
  File "//preprocess_spec.py", line 611, in <module>
    sys.exit(main())
  File "//preprocess_spec.py", line 605, in main
    out_spec = process_swagger(in_spec, args.client_language, crd_mode)
  File "//preprocess_spec.py", line 239, in process_swagger
    spec = add_apidiscovery_definitions(spec)
  File "//preprocess_spec.py", line 179, in add_apidiscovery_definitions
    with open(APIDISCOVERY_DEFINITIONS_PATH, 'r') as apidiscovery_file:
FileNotFoundError: [Errno 2] No such file or directory: '//apidiscovery_definitions.json'

[tomplus]

@brendandburns could you take a look? thanks

/cc brendandburns
/cc yliaog
/cc copilot

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In response to this:

@brendandburns could you take a look? thanks

/assign brendandburns
/assign yliaog
/assign copilot

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[tomplus]

/cc brendandburns
/cc yliaog
/cc copilot

[yliaog]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tomplus, yliaog

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