Add processing status label

[masih]

While the date is being prepared, dealt with, etc. the status endpoint should show processing as the status to convey that no deal has been made (yet).

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1. Integrate processing status for blobs that are awaiting to be delt with
2. Update Swagger spec and documentation to express the existence of processing label.

[elijaharita]

Currently, the status string is grabbed directly from singularity. Do we need to add this status to singularity or do you mean for motion to override the returned singularity status in this situation?

[masih]

@xinaxu WDYT?

[xinaxu]

Which status field are you refering to? I only see status as string inside Replica struct.

motion/api/model.go

Line 22 in decdc1d

Status string `json:"status"`

[masih]

@xinaxu I think @elijaharita is referring to this.

@elijaharita the "processing" status refers to a state where motion has not asked Singularity to make a deal yet, i.e. data is being accumulated. In this case it makes sense to have the "processing" status in Motion.