registry-experimental: generate openapi doesn't support implicit references of configured projects

[timburks]

shell:/# registry-experimental generate openapi apis/google.com-apigeeregistry/versions/-/specs/protos
Error: "apis/google.com-apigeeregistry/versions/-/specs/protos" is not a valid spec name: invalid spec name "apis/google.com-apigeeregistry/versions/-/specs/protos": must match "^projects/([A-Za-z0-9-.]+)/locations/global/apis/([A-Za-z0-9-.]+)/versions/([A-Za-z0-9-.]+)/specs/([A-Za-z0-9-.]+)$"
Usage:
  registry-experimental generate openapi [flags]

Flags:
  -h, --help             help for openapi
      --spec-id string   ID to use for generated spec (default "generated")

Global Flags:
      --address string             the server and port of the Registry API (eg. localhost:8080)
  -c, --config string              name of a configuration profile or path to config file
      --filter string              Filter selected resources
      --registry.address string    the server and port of the Registry API (eg. localhost:8080)
      --registry.insecure          if specified, client connects via http (not https)
      --registry.location string   the API Registry location
      --registry.project string    the API Registry project
      --registry.token string      the token to use for authorization to the API Registry

shell:/# registry-experimental generate openapi projects/catalog/locations/global/apis/google.com-apigeeregistry/versions/-/specs/protos
  INFO[0000] generate openapi for projects/catalog/locations/global/apis/google.com-apigeeregistry/versions/v1/specs/protos uid=e3841424
 DEBUG[0000] Computing projects/catalog/locations/global/apis/google.com-apigeeregistry/versions/v1/specs/protos/specs/generated uid=e3841424
 DEBUG[0000] Running /usr/local/bin/protoc protos/google/api/annotations.proto protos/google/api/client.proto protos/google/api/field_behavior.proto protos/google/api/http.proto protos/google/api/httpbody.proto protos/google/api/launch_stage.proto protos/google/api/resource.proto protos/google/cloud/apigeeregistry/v1/provisioning_service.proto protos/google/cloud/apigeeregistry/v1/registry_models.proto protos/google/cloud/apigeeregistry/v1/registry_service.proto protos/google/longrunning/operations.proto protos/google/rpc/status.proto -I protos --openapi_out=.
 uid=e3841424
 DEBUG[0000] protoc output: 
          uid=e3841424
shell:/#