bug(oas3schema): some required objects are not being inserted into the schemas

[fdymylja]

In oas3schema, some objects are not being added correctly to the schemas.

To reproduce:

make testapp
curl localhost:8080/spec

passing the input into parse the input into https://editor.swagger.io/ it will

returns the following errors:

Semantic error at paths./tmos.core.rbac.v1alpha1/rolebindings.get.responses.200.content.application/json.schema.$ref
$refs must reference a valid location in the document
Jump to line 158
Resolver error at paths./tmos.runtime.v1alpha1/moduledescriptors.get.responses.200.content.application/json.schema.properties.modules.items.properties.stateTransitions.items.properties.protoDependencies.items.properties.messageType.items.properties.extensionRange.items.$ref
Could not resolve reference: #/components/schemas/google.protobuf.ExtensionRange
Jump to line 198
Resolver error at paths./tmos.runtime.v1alpha1/moduledescriptors.get.responses.200.content.application/json.schema.properties.modules.items.properties.stateTransitions.items.properties.protoDependencies.items.properties.messageType.items.properties.reservedRange.items.$ref
Could not resolve reference: #/components/schemas/google.protobuf.ReservedRange
Jump to line 198