Stephen J Day fe1dce6a91 pkg/archive: remove unnecessary Archive and Reader type
The `archive` package defines aliases for `io.ReadCloser` and
`io.Reader`. These don't seem to provide an benefit other than type
decoration. Per this change, several unnecessary type cases were
removed.

Signed-off-by: Stephen J Day <stephen.day@docker.com>
Upstream-commit: aa2cc18745cbe0231c33782f0fa764f657e3fb88
Component: engine
2016-10-20 19:31:24 -07:00
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