Enable fail2ban for z-push and add a test for it

conf/fail2ban/filter.d/z-push.conf

@@ -0,0 +1,15 @@
+# Source: https://kb.kopano.io/display/ZP/Fail2Ban+support
+[INCLUDES]
+before = common.conf
+[Definition]
+# Option:  failregex
+# Notes.:  regex to match the password failures messages in the logfile. The
+#          host must be matched by a group named "host". The tag "<HOST>" can
+#          be used for standard IP/hostname matching and is only an alias for
+#          (?:::f{4,6}:)?(?P<host>[\w\-.^_]+)
+# Values:  TEXT
+#
+failregex = IP: <HOST> failed to authenticate user
+ignoreregex =
+[Init]
+journalmatch = _SYSTEMD_UNIT=fail2ban.service

conf/fail2ban/jails.conf

@@ -88,3 +88,10 @@ bantime = 3600
 [slapd]
 enabled = true
 logpath = /var/log/ldap/slapd.log
+
+[z-push]
+enabled = true
+port     = http,https
+filter   = z-push
+logpath  = /var/log/z-push/z-push-error.log
+maxretry = 20