Major Description
The configuration keys "sasl_mechanisms" and "ssl_sasl_mechanisms" allows ns_server to specify which sasl mechanisms to use for plain and tls connections. Previously we copied this value into a temporary string and converted the mechanism name to uppercase to simplify checking later on, but according to the rfc this isn't needed as the mechanisms should already be in uppercase in order to be a valid mechanism:
3.1. Mechanism Naming
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SASL mechanisms are named by character strings, from 1 to 20
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characters in length, consisting of ASCII [ASCII] uppercase letters,
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digits, hyphens, and/or underscores.
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