Boost policy to 4.1.3, obey lintian and demand recent debhelper (or dh-systemd), VCS fields to provide a branch

debian/changelog

@@ -9,6 +9,7 @@ fail2ban (0.10.2-1) unstable; urgency=medium
     - IPv6 support (Closes: #881648, #470417)
   * A number of new patches added to address failing tests from
     https://github.com/fail2ban/fail2ban/pull/2025
+  * Boosted policy to 4.1.3
 
   [ Viktor Szépe ]
   * Install provided config for monit under /etc/monit/conf-available

debian/control

@@ -2,11 +2,15 @@ Source: fail2ban
 Section: net
 Priority: optional
 Maintainer: Yaroslav Halchenko <debian@onerussian.com>
-Build-Depends: debhelper (>= 9), python3, python3-pyinotify, dh-systemd
+Build-Depends:
+ debhelper (>= 9)
+ , debhelper (>= 9.20160709) | dh-systemd
+ , python3
+ , python3-pyinotify
 Homepage: http://www.fail2ban.org
-Vcs-Git: git://github.com/fail2ban/fail2ban.git
+Vcs-Git: git://github.com/fail2ban/fail2ban.git -b debian
 Vcs-Browser: http://github.com/fail2ban/fail2ban
-Standards-Version: 3.9.7
+Standards-Version: 4.1.3
 
 
 Package: fail2ban