[COMMON] Fix condition bracket bashisms - step 2

pointed out by checkbashisms

$ mycmd=$(tox -e checkbashisms
| grep '(\[\[ foo \]\] should be \[ foo \])'
| sed -e "s@^[^.]*\(.[^ ]*\) line \([0-9]*\) .*@sed -i '\2s/\\\[\\\[\\\(
[^]]*\\\)\\\]\\\]/[\\\1]/g' \1;@")

$ eval $mycmd

plus fix manually quoting hells induced and bash specific regex
and multi-conditions

Issue-ID: OOM-2643
Signed-off-by: Guillaume Lambert <guillaume.lambert@orange.com>
Change-Id: Ia9626256b5efc837ba12b25d351c8d8a0ba75fb4
diff --git a/kubernetes/contrib/metallb-loadbalancer-inst/install-metallb-on-cluster.sh b/kubernetes/contrib/metallb-loadbalancer-inst/install-metallb-on-cluster.sh
index 44fe79a..bf2bc12 100755
--- a/kubernetes/contrib/metallb-loadbalancer-inst/install-metallb-on-cluster.sh
+++ b/kubernetes/contrib/metallb-loadbalancer-inst/install-metallb-on-cluster.sh
@@ -76,9 +76,11 @@
 	generate_config_map $@
 }
 
-if [[ $# -eq 1 ]] && [[ $1 = "-h" || $1 = "--help" ]]; then
+if [ $# -eq 1 ] && [ "$1" = "-h" ]; then
 	usage
-elif [[ $# -eq 0 ]]; then
+if [ $# -eq 1 ] && [ "$1" = "--help" ]; then
+	usage
+elif [ $# -eq 0 ]; then
 	automatic_configuration
 else
 	manual_configuration $@