Misc fixes for impish builds

Change-Id: I68825a35c250a76c2293430271f6536d212fba3b
diff --git a/ndnmap-data-collector/debian/control b/ndnmap-data-collector/debian/control
index 29e9cca..a395e78 100644
--- a/ndnmap-data-collector/debian/control
+++ b/ndnmap-data-collector/debian/control
@@ -1,8 +1,7 @@
 Source: ndnmap-data-collector
 Priority: extra
 Maintainer: John DeHart <jdd@wustl.edu>
-Build-Depends: debhelper (>= 8.0.0),
- dh-systemd (>= 1.5),
+Build-Depends: debhelper (>= 9.20160709),
  python3 (>= 3.5.0),
  pkg-config (>= 0.26),
  libndn-cxx-dev (>= 0.8.0)