[COMMON] Fix read -s, echo -e and $'...' bashisms

pointed out by checkbashisms.

Issue-ID: OOM-2643
Signed-off-by: Guillaume Lambert <guillaume.lambert@orange.com>
Change-Id: I527f9b8dcad98a5dd9eb30390d26c95c1d918c09
diff --git a/kubernetes/robot/demo-k8s.sh b/kubernetes/robot/demo-k8s.sh
index 5e4e216..0d30557 100755
--- a/kubernetes/robot/demo-k8s.sh
+++ b/kubernetes/robot/demo-k8s.sh
@@ -93,7 +93,10 @@
 	case $key in
     	init_robot)
 			TAG="UpdateWebPage"
-			read -s -p "WEB Site Password for user 'test': " WEB_PASSWORD
+			echo "WEB Site Password for user 'test': "
+			stty -echo
+			read WEB_PASSWORD
+			stty echo
 			if [ "$WEB_PASSWORD" = "" ]; then
 				echo ""
 				echo "WEB Password is required for user 'test'"