Enabling keepalived on proxy nodes

The patch prepares keepalived and horizon to
work in active-active mode in proxy (prx*) nodes.

Change-Id: I071f13bbb5f6a1d8d87a64308949da4f3b593a2b
Related-PROD: PROD-24978
diff --git a/defaults/keepalived/init.yml b/defaults/keepalived/init.yml
new file mode 100644
index 0000000..f39d80e
--- /dev/null
+++ b/defaults/keepalived/init.yml
@@ -0,0 +1,3 @@
+parameters:
+  _param:
+    keepalived_openstack_web_vrrp_script_check_pidof_args: "nginx"