Uplift HAProxy to address CVEs

The current default version of HAProxy is vulnerable to multiple CVEs:
CVE-2018-20102
CVE-2018-20103
CVE-2018-20615

Which HAProxy versions >=1.8.17 addresses

Change-Id: I8a387a43976dd105ea3c1dd9b74cd435a8f56864

global/software/config/versions.yaml

@@ -487,7 +487,7 @@ data:
         etcdctl: quay.io/coreos/etcd:v3.2.18
       haproxy:
         anchor: gcr.io/google_containers/hyperkube-amd64:v1.11.6
-        haproxy: docker.io/haproxy:1.8.3
+        haproxy: docker.io/haproxy:1.8.19
       ingress: {}
       kubectl: gcr.io/google-containers/hyperkube-amd64:v1.11.6
       pause: gcr.io/google-containers/pause-amd64:3.1