exim test cases extended: cover short form of the logging (without session-id, gh-1771)

fail2ban/tests/files/logs/exim

@@ -60,6 +60,8 @@
 2016-03-21 04:07:49 [25874] 1ahr79-0006jK-G9 SMTP connection from (voyeur.webair.com) [174.137.147.204]:44884 I=[172.89.0.6]:25 closed by DROP in ACL
 # failJSON: { "time": "2016-03-21T04:33:13", "match": true , "host": "206.214.71.53" }
 2016-03-21 04:33:13 [26074] 1ahrVl-0006mY-79 SMTP connection from riveruse.com [206.214.71.53]:39865 I=[172.89.0.6]:25 closed by DROP in ACL
+# failJSON: { "time": "2016-03-21T04:33:14", "match": true , "host": "192.0.2.33", "desc": "short form without optional session-id" }
+2016-03-21 04:33:14 SMTP connection from (some.domain) [192.0.2.33] closed by DROP in ACL
 
 # failJSON: { "time": "2016-04-01T11:08:39", "match": true , "host": "192.0.2.1" }
 2016-04-01 11:08:39 [18643] no MAIL in SMTP connection from host.example.com (SERVER) [192.0.2.1]:1418 I=[172.89.0.6]:25 D=34s C=EHLO,AUTH