clush: add remote file copy retrieving support (distant to local)

[thiell]

This feature should be added to clush. Distant files should be retrieved to the local node in parallel, with added hostname-based tagging. At least, features provided by rpdcp should be available.

Clush command options could be something like:
{{{

clush -w saturn[32-63] --rcopy /var/log/messages --dest /tmp/logs/

}}}

And maybe also a reverse-reverse copy in order to copy hostname-tagged local files to remote nodes.

[thiell]

[st-cea] Due to 1.3 feature freeze, this is now a 1.4 feature.

[thiell]

[st-cea] Need also a clush man page update for adding {{{--rcopy}}} and for changes made in r396 (allow multiple source files).

[thiell]

[st-cea] * First library support in r401 (WorkerSsh only)

• clush --rcopy support in r402

[thiell]

[st-cea] * ''rpdcp'' support in WorkerPdsh in r403

[thiell]

[st-cea] * man page updated in r405