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print help when action is not specified

This implements FASTMOVING-929, see this ticket for details.
Whenever action is not specified (e.g. only "kpet set/run/..." is called
without params), we log.error explain the problem and print parser help.

V2:
* print parser help message to both stdout and stderr

Signed-off-by: Jakub Racek <jracek@redhat.com>

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