add nginx to fail2ban

fail2ban/filter.d/nginx.conf

+# Fail2Ban configuration file
+#
+# Author: Vitaly Lipatov
+#
+# $Revision: 728 $
+#
+
+[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 = ^<HOST> - -
+
+# Option:  ignoreregex
+# Notes.:  regex to ignore. If this regex matches, the line is ignored.
+# Values:  TEXT
+#
+#ignoreregex =