Restore smtpd.DEBUGSTREAM at the end of test_smtpd. This fixes a subsequent refleak in test_smtplib.
Restore smtpd.DEBUGSTREAM at the end of test_smtpd.
This fixes a subsequent refleak in test_smtplib.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator