Fix error in VILLAScontroller schema

[stv0g]

[REDOCUSAURUS_PLUGIN] errors while bundling spec external/controller/doc/openapi.yaml
[1] external/controller/villas/controller/schemas/manager/kubernetes/create.yaml:10:7 at #/properties/schema/additionalProperties
Two schemas are referenced with the same name but different content. Renamed schema to schema-2.
 8 | schema:
 9 |   additionalProperties:
10 |     $ref: https://json-schema.org/draft-04/schema
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
11 |
Warning was generated by the bundler rule.
[2] external/controller/doc/openapi.yaml:315:21 at #/paths/~1component~1{uuid}/post/requestBody/content/application~1json/schema/properties/parameters/oneOf/1
Two schemas are referenced with the same name but different content. Renamed create to create-2.
313 | oneOf:
314 | - $ref: ../villas/controller/schemas/manager/generic/create.yaml
315 | - $ref: ../villas/controller/schemas/manager/kubernetes/create.yaml
    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
316 | - $ref: ../villas/controller/schemas/simulator/dpsim/start.yaml
317 | - $ref: ../villas/controller/schemas/simulator/dummy/start.yaml
Warning was generated by the bundler rule.
[3] external/controller/doc/openapi.yaml:317:21 at #/paths/~1component~1{uuid}/post/requestBody/content/application~1json/schema/properties/parameters/oneOf/3
Two schemas are referenced with the same name but different content. Renamed start to start-2.
315 |             - $ref: ../villas/controller/schemas/manager/kubernetes/create.yaml
316 |             - $ref: ../villas/controller/schemas/simulator/dpsim/start.yaml
317 |             - $ref: ../villas/controller/schemas/simulator/dummy/start.yaml
    |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
318 |
319 | responses:
Warning was generated by the bundler rule.