include msgpack in thin.tgz

While msgpack is an extmod (it uses an platform-dependent .so) it
includes a pure python fallback.  Including it in thin will not create
a protability problem.
Preserve stdout, stderr and retcode from salt-ssh raw command

salt-ssh raw mode only emits stdout lines; it emits neither stderr nor
the return code.  salt-ssh raw works more like cmd.run rather than
cmd.run_all.  Preserving stdout, stderr and the return code are
imperative for validating the results of a salt-ssh raw command.

This stores 'stdout', 'stderr' and 'retcode' in the ret dictionary so
that the complete information can be emitted by the outputter.

Fixes #10432
Appease the pylint gods.

Fixes #10432
Merge pull request #10435 from plastikos/issue-10432

 Preserve stdout, stderr and retcode from salt-ssh raw command