Use /bin/sh as the shebang for scripts

rel/files/erl

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 ## This script replaces the default "erl" in erts-VSN/bin. This is necessary
 ## as escript depends on erl and in turn, erl depends on having access to a
@@ -31,4 +31,4 @@ export ROOTDIR
 export BINDIR
 export PROGNAME
 
-exec $CMD -boot $ROOTDIR/releases/$APP_VSN/start_clean ${1+"$@"}
+exec $CMD -boot $ROOTDIR/releases/$APP_VSN/start_clean ${1+"$@"}

rel/files/riak

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 # -*- tab-width:4;indent-tabs-mode:nil -*-
 # ex: ts=4 sw=4 et
 

rel/files/riak-admin

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 RUNNER_SCRIPT_DIR={{runner_script_dir}}
 RUNNER_SCRIPT=${0##*/}

rel/files/search-cmd

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 ORIGINAL_DIR=$(pwd)
 RUNNER_SCRIPT_DIR={{runner_script_dir}}