It will become more complex when options will contain rack lists.
It's a good change regardless, as it reduces duplication and makes
parsing uniform. We already diverged to use stoi / stol / stoul.
The change in create_keyspace_statement.cc to add a catch clause is
needed because get_replication_factor() now throws
configuration_exception on parsing errors instead of
std::invalid_argument, so the existing catch clause in the outer scope
is not effective. That loop is trying to interpret all options as RF
to run some validations. Not all options are RF, and those are
supposed to be ignored.
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