Merge "Change launch scripts to python3 shebangs"

launch/dns.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Launch a new OpenStack project infrastructure node.
 

launch/sshclient.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Update the base image that is used for devstack VMs.
 

launch/utils.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Update the base image that is used for devstack VMs.