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we already have generic operator<< based formatter for sequence-alike ranges defined in `utils/to_string.hh`, but as a part of efforts to address #13245, we will eventually drop the formatter. to prepare for this change, we should create/find the alternatives where the operator<< for printing the ranges is still used. Boost::program_options is one of them. it prints the options' default values using operator<< in its error message or usage. so in order to keep it working, we define operator<< for `vector<sstring>` here. if there are more types are required, we will need the generalize this formatter. if there are more needs from different compiling units, we might need to extract this helper into, for instance, `utils/to_string.hh`. but we should do this after removing it. Refs #13245 Signed-off-by: Kefu Chai <kefu.chai@scylladb.com> Closes scylladb/scylladb#17413