qemu-iotests: Improve portability by searching bash in the $PATH

Bash is not always installed as /bin/bash. In particular on OpenBSD,
the package installs it in /usr/local/bin.
Use the 'env' shebang to search bash in the $PATH.

Patch created mechanically by running:

  $ git grep -lE '#! ?/bin/bash' -- tests/qemu-iotests \
    | while read f; do \
      sed -i 's|^#!.\?/bin/bash$|#!/usr/bin/env bash|' $f; \
    done

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/001

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Test simple read/write using plain bdrv_read/bdrv_write
 #

tests/qemu-iotests/002

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Test simple read/write using plain bdrv_pread/bdrv_pwrite
 #

tests/qemu-iotests/003

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Test simple read/write using bdrv_aio_readv/bdrv_aio_writev
 #

tests/qemu-iotests/004

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Make sure we can't read and write outside of the image size.
 #

tests/qemu-iotests/005

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Make sure qemu-img can create 5TB images
 #

tests/qemu-iotests/007

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Check for one possible case of qcow2 refcount corruption.
 #

tests/qemu-iotests/008

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Test simple asynchronous read/write operations.
 #

tests/qemu-iotests/009

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Nolan I qcow2 corruption - incorrectly reports free clusters
 #

tests/qemu-iotests/010

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Nolan II qcow2 corruption - wrong used cluster
 #

tests/qemu-iotests/011

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Test for AIO allocation on the same cluster
 #

tests/qemu-iotests/012

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Make sure we can open read-only images
 #

tests/qemu-iotests/013

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # qcow2 pattern test, empty and compressed image - 4k cluster patterns
 #

tests/qemu-iotests/014

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # qcow2 pattern test, complex patterns including compression and snapshots
 # Using patterns for 4k cluster size.

tests/qemu-iotests/015

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Combined test to grow the refcount table and test snapshots.
 #

tests/qemu-iotests/017

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Simple backing file reads
 #

tests/qemu-iotests/018

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Merge backing file into test image when converting the image
 #

tests/qemu-iotests/019

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # When using a backing file for the output image in qemu-img convert,
 # the backing file clusters must not copied. The data must still be

tests/qemu-iotests/020

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Commit changes to backing file
 #

tests/qemu-iotests/021

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Test handling of invalid patterns arguments to qemu-io
 #

tests/qemu-iotests/022

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Test bdrv_load/save_vmstate using the usual patterns
 #