Add conntrack package

kube-proxy service requires conntrack binary.

Change-Id: I117e9a0102d87b13847ec75637607e14ea3984af
diff --git a/kubernetes/map.jinja b/kubernetes/map.jinja
index f426e3c..08054e4 100644
--- a/kubernetes/map.jinja
+++ b/kubernetes/map.jinja
@@ -2,7 +2,7 @@
 
 {% set common = salt['grains.filter_by']({
     'Debian': {
-        'pkgs': ['curl', 'git', 'apt-transport-https', 'python-apt', 'socat', 'openssl'],
+        'pkgs': ['curl', 'git', 'apt-transport-https', 'python-apt', 'socat', 'openssl', 'conntrack'],
         'services': [],
         'version': version|float,
     },