dummysmtpd: fix EOF handling on newer versions of OpenSSL

Explanations inline.

tests/dummysmtpd.py

@@ -31,8 +31,15 b' def log(msg):'
 def mocksmtpserversession(conn, addr):
     conn.send(b'220 smtp.example.com ESMTP\r\n')
 
-    line = conn.recv(1024)
+    try:
+        # Newer versions of OpenSSL raise on EOF
+        line = conn.recv(1024)
+    except ssl.SSLError:
+        log('no hello: EOF\n')
+        return
+
     if not line.lower().startswith(b'ehlo '):
+        # Older versions of OpenSSl don't raise
         log('no hello: %s\n' % line)
         return
 

tests/test-patchbomb-tls.t

@@ -98,7 +98,7 b' Without certificates:'
   $ wait_log "no hello:"
   $ cat ../log
   connection from * (glob)
-  no hello: b''
+  no hello: (b''|EOF) (re)
   $ : > ../log
 
 With global certificates: