Implement Rex interface for (Supermicro) SMASH-CLP System Management Shell

[alip]

Rationale: Automate reboot of supermicro servers (so provision is less manual)

What we have on a typical supermicro server:

ATEN SMASH-CLP System Management Shell, version 1.05
Copyright (c) 2008-2009 by ATEN International CO., Ltd.
All Rights Reserved
-> help
/

  The managed element is the root

  Verbs :
        cd
        show
        help
        version
        exit
-> version                                                                                                                                                               
ATEN SMASH CLP Shell Version 1.05     

Rex has a similar interface for Idrac:

Rex/lib/Rex/Interface/Shell/Idrac.pm

Lines 31 to 35 in 1a0e85e

	eval {
	($output) = $con->direct_exec('version');
	1;
	};
	if ( $output && $output =~ m/SM CLP Version: / ) {

we need exactly the same functionality over the module except for the regex ^^.

without this, rex will incorrectly assume /bin/sh.

Upstream:

This feature is useful for the community, so it's a good idea to ship it upstream and spread the love.

History:

A busybox shell used to be present on this type of motherboards but was removed because sekurity.

The version we use currently is new enough:

-> shell sh
shell command not support now.

[amaxine]

Thank you for the thorough writeup, will take a look at handling this!