Use template instead of copy for sysctl settings

roles/common-system/tasks/sysctl.yml

@@ -1,5 +1,5 @@
 ---
 
 - name: Install custom sysctl variables
-  copy: src=sysctl.conf dest=/etc/sysctl.d/system.conf
+  template: src=sysctl.conf.j2 dest=/etc/sysctl.d/system.conf
   notify: Load sysctl variables

roles/mesh-routing/tasks/sysctl.yml

@@ -1,5 +1,5 @@
 ---
 
 - name: Install routing specific sysctl variables
-  copy: src=sysctl.conf dest=/etc/sysctl.d/routing.conf
+  template: src=sysctl.conf.j2 dest=/etc/sysctl.d/routing.conf
   notify: Load sysctl variables