make getOutstandingUploads thread-safe

Hayley Swimelarrequested to merge
thread-safe-purge-uploads into 3-optimize-the-s3-storage-driver-s-walk-function

This MR ensures prevents unsafe map and array accesses within the WalkFn used by getOutstandingUploads.

Additonally, this removes registry/storage/error.go and it's singular function, pushError. As pushError was only used in two places, both in getOutstandingUploads was was not suited to concurrent operations.

closes #8 (closed)

Edited by Hayley Swimelar

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