[3.8] bpo-27820: Fix AUTH LOGIN logic in smtplib.SMTP (GH-24118) #24833
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Fix auth_login logic (bpo-27820)
Also fix a longstanding bug in the SimSMTPChannel.found_terminator() method that causes inability to test
SMTP AUTH with initial_response_ok=False.
(cherry picked from commit 7591d94)
https://bugs.python.org/issue27820