Role system-sysctl-gateway: add small delay to sysctl startup

- sysctl starts to quick after modules-load and setting the nf_conntrack parameters fails

roles/system-sysctl-gateway/tasks/main.yml

@@ -5,3 +5,19 @@
     value: "{{ item.value }}"
     state: present
   with_items: "{{ sysctl_settings_gateway }}"
+
+- name: create systemd override dir for systemd-sysctl.service
+  file:
+    path: /etc/systemd/system/systemd-sysctl.service.d
+    state: directory
+    owner: root
+    group: root
+    mode: 0755
+
+- name: configure systemd unit overrides
+  template:
+    src: systemd_sysctl_service_overrides.j2
+    dest: /etc/systemd/system/systemd-sysctl.service.d/override.conf
+    owner: root
+    group: root
+    mode: 0644

roles/system-sysctl-gateway/templates/systemd_sysctl_service_overrides.j2

@@ -0,0 +1,2 @@
+[Service]
+ExecStartPre=/bin/sleep 3