util.sasl, util.sasl_cyrus: Updated method:mechanisms() to cache and re-use list of mechanisms.

util.sasl: Use the proper session-specific table of mechanisms when selecting a mechanism, and not the global table.

SASL: Simplified sasl_handler:mechanisms() to return a set, and not an array.

usermanager: Return a non-nil SASL handler from the null auth provider (fixes a traceback).

MUC: Fixed a traceback introduced in hg:bdc325ce9fbc.

net.dns: Call :cancel() on the current resolver instead of the prototype

util.roster: Initial skeleton commit

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