mod_sasl2_bind2, mod_sasl2_sm: Remove bind2 <features/> wrapper element
This was dropped from the spec. It's more consistent with SASL2.
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summary: Storage benchmark tool
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To benchmark `mod_storage_internal`:
prosodyctl mod_benchmark_storage internal
Does a number (aprox. 10000) of reads and writes and to the selected
storage driver and tells you how long it took.