Rehost Chunked{ByteArray,InputStream,OutputStream}

These utility classes are immensely useful for any fragmentation
workload. Rehost them so we can reuse them. This means we will end
up with non-constant maximum chunk size, but that's fine.

JIRA: CONTROLLER-1954
Change-Id: I046ddb16d1e5c7210a781d63f302c3ee3e75742d
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>