note about csh

Signed-off-by: Nico Schottelius <nico@brief.schottelius.org>

doc/dev/logs/2012-05-31.csh-compatibilty

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+If root's shell is csh or other non-sh compatible, we have problems.
+See https://github.com/telmich/cdist/issues/54.
+
+Stuff to try out:
+
+    - "-o SendEnv name" [may break remote exec/copy]
+    - cat * | /bin/sh -s could also work, needs testing though
+
+Somebody who is affected should give this a try, especially the 2nd
+variant.