Move database creation/destruction scripts to sh

Bash is not available on /bin/bash on some linux distros like NixOS

test/create_test_db

@@ -1,4 +1,4 @@
-#! /bin/bash
+#! /bin/sh
 if [ -z "$1" ]
   then
     echo "Please supply the connection uri for the user with create database privileges"

test/destroy_test_db

@@ -1,4 +1,4 @@
-#! /bin/bash
+#! /bin/sh
 if [ -z "$1" ]
   then
     echo "Please supply the connection uri for the user with create database privileges"