Support to retrieve the content of a file from a patch set via REST

By GET on
/changes/<change-id>/revisions/<revision-id>/files/<patch-id>/content
it is now possible to retrieve the content of a certain file from a
patch set. The file content is returned as base64 encoded string so
that also binary files can be handled.

Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
Change-Id: I429ce448c22b7b3b6ffd5503463676a798ea162a
4 files changed