[COMMON] Fix function declarations bashisms

pointed out by checkbashisms.

$ mycmd=$(tox -e checkbashisms | grep "^possible .*'function' is useless
" | sed -e "s@^[^.]*\(.[^ ]*\) line \([0-9]*\) .*@sed -i -e '\2s/functio
n \\\([^ ()]*\\\) *(\\\?)\\\?/\\\1 ()/\' -e '\2s/(){/() {/' \1;@")

$ eval $mycmd

Issue-ID: OOM-2643
Signed-off-by: Guillaume Lambert <guillaume.lambert@orange.com>
Change-Id: Ic41c8ba8288b7a90db9f5775cd601c09ff2ab663
diff --git a/kubernetes/sdnc/resources/geo/bin/switchVoting.sh b/kubernetes/sdnc/resources/geo/bin/switchVoting.sh
index 076f1ea..65b7626 100755
--- a/kubernetes/sdnc/resources/geo/bin/switchVoting.sh
+++ b/kubernetes/sdnc/resources/geo/bin/switchVoting.sh
@@ -16,7 +16,7 @@
 # limitations under the License.
 */}}
 
-function usage()
+usage ()
 {
     echo usage: switchVoting.sh primary\|secondary
     exit 1