Fix shebang of commands

Fix shebang of following commands.
  $ grep '#!/usr/bin/python' swift/bin/*
  swift/bin/swift-account-info:#!/usr/bin/python
  swift/bin/swift-container-info:#!/usr/bin/python
  swift/bin/swift-container-sync:#!/usr/bin/python
  swift/bin/swift-recon:#!/usr/bin/python
  swift/bin/swift-ring-builder:#!/usr/bin/python
  swift/bin/swift-ring-builder-analyzer:#!/usr/bin/python

Change-Id: I564d1d8abd76eba57730fc2f30263b0a0f809867
Closes-Bug: #1481623

bin/swift-account-info

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 # Licensed under the Apache License, Version 2.0 (the "License"); you may not
 # use this file except in compliance with the License. You may obtain a copy
 # of the License at

bin/swift-container-info

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 # Licensed under the Apache License, Version 2.0 (the "License"); you may not
 # use this file except in compliance with the License. You may obtain a copy
 # of the License at

bin/swift-container-sync

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 # Copyright (c) 2010-2012 OpenStack Foundation
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

bin/swift-recon

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 # Copyright (c) 2014 Christian Schwede <christian.schwede@enovance.com>
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

bin/swift-ring-builder

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 # Copyright (c) 2014 Christian Schwede <christian.schwede@enovance.com>
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

bin/swift-ring-builder-analyzer

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 # Copyright (c) 2015 Samuel Merritt <sam@swiftstack.com>
 #
 # Licensed under the Apache License, Version 2.0 (the "License");