Implement FetchMissingBlobs and UploadMissingBlobs

Jürg Billeterrequested to merge
juerg/fetch-upload-missing-blobs into master

This implements the LocalCAS protocol methods FetchMissingBlobs and UploadMissingBlobs with support for dynamic remotes (!55 (merged)).

Depends on !55 (merged).

Edited by Jürg Billeter

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