Revert "replace bash shebang with '#!/usr/bin/env bash" for portability"

This reverts commit 86dace91.

build/tfs/common/common.sh

-#!/usr/bin/env bash
+#!/bin/bash
 set -e
 
 # set agent specific npm cache

build/tfs/common/node.sh

-#!/usr/bin/env bash
+#!/bin/bash
 set -e
 
 # setup nvm

build/tfs/linux/build-ia32.sh

-#!/usr/bin/env bash
+#!/bin/bash
 set -e
 ./build/tfs/linux/build.sh ia32 "$@"
\ No newline at end of file

build/tfs/linux/build-x64.sh

-#!/usr/bin/env bash
+#!/bin/bash
 set -e
 ./build/tfs/linux/build.sh x64 "$@"
\ No newline at end of file

build/tfs/linux/build.sh

-#!/usr/bin/env bash
+#!/bin/bash
 
 . ./build/tfs/common/node.sh
 . ./scripts/env.sh

build/tfs/linux/ia32/run-agent.sh

-#!/usr/bin/env bash
+#!/bin/bash
 
 if [ ! -f pat ]; then
 	echo "Error: file pat not found"

build/tfs/linux/ia32/xvfb.init

-#!/usr/bin/env bash
+#!/bin/bash
 #
 # /etc/rc.d/init.d/xvfbd
 #

build/tfs/linux/release.sh

-#!/usr/bin/env bash
+#!/bin/bash
 
 . ./scripts/env.sh
 . ./build/tfs/common/common.sh

build/tfs/linux/smoketest.sh

-#!/usr/bin/env bash
+#!/bin/bash
 set -e
 
 . ./build/tfs/common/node.sh

build/tfs/linux/x64/run-agent.sh

-#!/usr/bin/env bash
+#!/bin/bash
 
 if [ ! -f pat ]; then
 	echo "Error: file pat not found"

build/tfs/linux/x64/xvfb.init

-#!/usr/bin/env bash
+#!/bin/bash
 #
 # /etc/rc.d/init.d/xvfbd
 #

resources/linux/debian/postrm.template

-#!/usr/bin/env bash
+#!/bin/bash
 #
 # Copyright (c) Microsoft Corporation. All rights reserved.
 # Licensed under the MIT License. See License.txt in the project root for license information.

scripts/env.sh

-#!/usr/bin/env bash
+#!/bin/bash
 export npm_config_disturl=https://atom.io/download/electron
 export npm_config_target=$(node -p "require('./package.json').electronVersion")
 export npm_config_runtime=electron

scripts/npm.sh

-#!/usr/bin/env bash
+#!/bin/bash
 
 if [[ "$OSTYPE" == "darwin"* ]]; then
 	realpath() { [[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"; }

scripts/test-integration.sh

-#!/usr/bin/env bash
+#!/bin/bash
 set -e
 
 if [[ "$OSTYPE" == "darwin"* ]]; then

scripts/test-mocha.sh

-#!/usr/bin/env bash
+#!/bin/bash
 
 if [[ "$OSTYPE" == "darwin"* ]]; then
 	realpath() { [[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"; }

scripts/test.sh

-#!/usr/bin/env bash
+#!/bin/bash
 
 
 if [[ "$OSTYPE" == "darwin"* ]]; then

src/vs/base/node/terminateProcess.sh

-#!/usr/bin/env bash
+#!/bin/bash
 
 terminateTree() {
     for cpid in $(/usr/bin/pgrep -P $1); do