Related changes:
Split docker-related test-helper functions from pkg/sorted/mongo.
These helper functions are now also used in the pkg/blobserver/mongo
tests too.
Also fixed a typo in a comment in pkg/blob/fetcher.go and a missing variable in
debug output in pkg/blobserver/storagetest/storagetest.go
Addresses http://camlistore.org/issue/127
Change-Id: I8b6f57f9ced066d6f83788fdcc87be6619c65c3c
Conflicts:
pkg/blob/fetcher.go
Govert Versluis