Goal: 

• We receive some content in the metadata when the grpc message arrives throuch RHC, we need to take that metadata and merge with another structure that is the one we will send back to RHC
• Our metadata will have the following format, at least for now:

contentType := fmt.Sprintf("multipart/form-data; boundary=%s", boundary)
Metadata: map[string]string{
	"Content-Type": contentType,
},

Acceptance Criteria:

A list of verification conditions, successful functional tests, or expected outcomes in order to declare this story/task successfully completed.

• Take the incoming metadata and merge it with our own metadata