[EDGEPOD-226] Add installing strongswan to router role

Also fixed ansible-lint failures

Change-Id: I78fbab0a9e2f45ea4f5989c255f09b47ef01bdcc
diff --git a/aether-playbook/roles/router/linux/handlers/main.yml b/aether-playbook/roles/router/linux/handlers/main.yml
index 6408d79..0796da0 100644
--- a/aether-playbook/roles/router/linux/handlers/main.yml
+++ b/aether-playbook/roles/router/linux/handlers/main.yml
@@ -18,3 +18,6 @@
 
 - name: netplan apply
   command: netplan apply
+
+- name: ipsec restart
+  command: ipsec restart
\ No newline at end of file