Ingress: Clean prometheus-nginx.socket on startup

This PS cleans the prometheus-nginx.socket on startup of the container,
which is required to allow the container, as opposed to the pod, restart.

Change-Id: I7906e85a200f6fb92467371218b4e5957add39f4
Signed-off-by: Pete Birley <pete@port.direct>

ingress/templates/bin/_ingress-controller.sh.tpl

@@ -20,6 +20,7 @@ set -ex
 COMMAND="${@:-start}"
 
 function start () {
+  rm -fv /tmp/prometheus-nginx.socket
   exec /usr/bin/dumb-init \
       /nginx-ingress-controller \
       {{- if eq .Values.deployment.mode "namespace" }}

mariadb/templates/bin/_mariadb-ingress-controller.sh.tpl

@@ -20,6 +20,7 @@ set -ex
 COMMAND="${@:-start}"
 
 function start () {
+  rm -fv /tmp/prometheus-nginx.socket
   exec /usr/bin/dumb-init \
       /nginx-ingress-controller \
       --force-namespace-isolation \