orchestra: allow runtime logging for sh

orchestra: allow runtime logging for sh

When run.run is used with 'stdout' argument, the output of run command
is read to the given stream and logged with corresponding level only after
completion, which is different from the default behaviour. This 'hides'
useful information when, for example, the command is hung or stuck.
Aso it is usually handy when there are some data can be found
in the log for a prolonged command execution during runtime.

This patch addresses the issue.

Signed-off-by: Kyr Shatskyy <kyrylo.shatskyy@suse.com>