This adds the ability to provide a distinct authorization identifier for use
by SASL mechanisms. Not all SASL mechanisms support this operation, in
particular CRAM-MD5.
Both the javax and provided SASL implementations are extended, and an authzid
parameter added to the authenticate method.
The authorization identifier is passed as a EntityBareJid in order to assure the
correct form.
Resolves SMACK-677.
Minor-Modifications-By: Florian Schmaus <flo@geekplace.eu>
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