Fix for receiving untagged response during SASL auth #743
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This fixes #729 and adds tests.
Motivation:
The client will hang if it receives an untagged response during authentication. Gmail does send such a response, and Gmail OAUTH is thus broken without this fix.
Thanks for @stephengoodman for tracking down this issue.
Modifications:
Ignore untagged responses inside
AuthenticationStateMachine. Add tests.Result:
Gmail authentication works.