repair: fail if unknown option is used
repair: fail if unknown option is used

As requested in issue #79, this patch ensures that if the user attempts
to pass an unknown repair option, the operation fails rather than the
option simply be ignored.

An "unknown repair option" may be one of Cassandra's options we don't yet
support ("parallelism", "incremental", "jobThreads", "columnFamilies",
"dataCenters", "hosts" and "trace"), or any other unknown option name -
in either case, the operation will fail rather than ignore the option
which might have been important.

Signed-off-by: Nadav Har'El <625169824b719df98706d88646d0aae6f368ae4d@cloudius-systems.com>

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