LOLi c4ba46dead Handle invalid options in arc_summary
If an invalid option is provided to arc_summary.py we handle any error
thrown from the getopt Python module and print the usage help message.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: loli10K <ezomori.nozomu@gmail.com>
Closes #6983
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