switch from sh to bash, add env

code/get-logs.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
 MYDIR=$(dirname $0)
 
 if [ ! -e "${MYDIR}/core-api-producer/payload.log" ]; then

code/remove-logdirs.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
 
 if [ ! -d "./broker0" ]; then
     echo "ERROR: Can not find broker directory in current working dir."