Implement /usr/bin/env as the shebang in all bash scripts

In order to be more consistent, and also account for different
environments and platforms, this patch implements the use of
#!/usr/bin/env as the shebang for all bash scripts in the
environment.

Closes-Bug: #1485557
Change-Id: I93e6a47fd6be816620682eddb2880e38f11bf675

playbooks/roles/galera_server/files/mysql_init.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 ### BEGIN INIT INFO
 # Provides:          mysql

playbooks/roles/lxc_container_create/templates/autodev.j2

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 cd ${LXC_ROOTFS_MOUNT}/dev
 mkdir net
 mknod net/tun c 10 200

playbooks/roles/os_heat/files/templates/AWS_RDS_DBInstance.yaml

@@ -95,8 +95,8 @@ Resources:
             MasterUserPassword: {Ref: MasterUserPassword}
             WaitHandle: {Ref: WaitHandle}
           - |
-            #!/bin/bash -v
-            #
+            #!/usr/bin/env bash
+            set -v
             iptables -F
 
             # Helper function

scripts/federated-login.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Copyright 2015, Rackspace US, Inc.
 #

scripts/run-playbooks.sh

@@ -37,7 +37,7 @@ info_block "Checking for required libraries." 2> /dev/null || source $(dirname $
 ## Main ----------------------------------------------------------------------
 # Create a simple task to bounce all networks within a container.
 cat > /tmp/ensure_container_networking.sh <<EOF
-#!/bin/bash
+#!/usr/bin/env bash
 INTERFACES=""
 INTERFACES+="\$(awk '/auto/ {print \$2}' /etc/network/interfaces) "
 INTERFACES+="\$(ls -1 /etc/network/interfaces.d/ | awk -F'.cfg' '{print \$1}')"