Add alternate certs (#260)

Co-authored-by: Wayne Werner <wayne@waynewerner.com>

aiosmtpd/tests/certs/server_alt.crt

@@ -0,0 +1,23 @@
+-----BEGIN CERTIFICATE-----
+MIID5jCCAs6gAwIBAgIJAMEFH58o28ymMA0GCSqGSIb3DQEBCwUAMIGGMQswCQYD
+VQQGEwJVUzELMAkGA1UECAwCQVIxETAPBgNVBAcMCE1hdW1lbGxlMREwDwYDVQQK
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+aiIwFDAfBgNVHSMEGDAWgBS1ZwfD6bcyw1WMEP+2ol3RaiIwFDAPBgNVHRMBAf8E
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+Da0JhUcFhewjvkfjBS/pMWRQGx35IRZKztbq3PBhgIS7oCnpqlHWwXqID3Ygypee
+C3ZNoedWvgI9HAPZCL/Se2Dv+fh2WrARECMPxEgIJ53vCjmAAO/nt7gKHZHW5KgW
+DcsdcLE5nfVwUEyS+gJvMEx56hUdYldBN2plXqumMsaMXyTPYCzqaNxHTBcTJogd
+tNzUk0M0+I1PRS3/47pZOex8fbbok0nkdGoHT02URv/+7MV7dwzOmuG0qdtDP0Yo
+rZjNk76yt3/azUuaSc9LqXN+BOeHCBz69xqwZEeV/jGQ+bl2XS/OgMKw
+-----END CERTIFICATE-----

aiosmtpd/tests/certs/server_alt.key

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvwIBADANBgkqhkiG9w0BAQEFAASCBKkwggSlAgEAAoIBAQDDaZsRN0vuvXI3
+nJc2faKMcCMIZ92k60yzNITrzJauuVNqZI31rxU2lEjBXWF+yd1Ag3JCJDzUYNly
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+Zs3AuvlTAgMBAAECggEBAKukbjWACa1pMBMS82tEjWun782pVfFPUO6zufFYoh5U
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+xXvhZaWMLnl57GOQL6GBba3LXQ==
+-----END PRIVATE KEY-----