Revision 1805339

On the '1.3.x-r1804008-group' branch: Merge r1804005, r1804008 and
r1804016 from trunk.

The shortlog of these changes is:

  r1804005: Fix an edge case in the dechunk bucket where it could erroneously
            report APR_EOF instead of an error.

  r1804008: Teach the dechunk bucket to return a proper error in presence
            of invalid (unparseable) chunk lengths, instead of returning
            an APR_EOF.

  r1804016: Following up on r1804005, don't return the "response is
            truncated" error code for an empty chunk size line.