[COMMON] Fix some bashisms

pointed out by checkbashisms:
- variable name HOSTNAME
- source instead of .
- sleep with suffix
- string increments

And migrate a few shebangs to /bin/sh

Issue-ID: OOM-2643
Signed-off-by: Guillaume Lambert <guillaume.lambert@orange.com>
Change-Id: I653c14454a3232b5a349ca1564ece53ddc94289d
diff --git a/kubernetes/sdnc/components/sdnc-prom/resources/bin/ensureSdncStandby.sh b/kubernetes/sdnc/components/sdnc-prom/resources/bin/ensureSdncStandby.sh
index 9485833..05a1701 100755
--- a/kubernetes/sdnc/components/sdnc-prom/resources/bin/ensureSdncStandby.sh
+++ b/kubernetes/sdnc/components/sdnc-prom/resources/bin/ensureSdncStandby.sh
@@ -1,6 +1,6 @@
-#!/bin/bash
-{{/*
+#!/bin/sh
 
+{{/*
 # Copyright © 2018 Amdocs
 #
 # Licensed under the Apache License, Version 2.0 (the "License");