use Python 3 shebang (#1076)

bin/catkin_find

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 

bin/catkin_init_workspace

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 

bin/catkin_make

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 

bin/catkin_make_isolated

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 

bin/catkin_test_results

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 

bin/catkin_topological_order

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 

doc/generate_cmake_rst.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Software License Agreement (BSD License)
 #

doc/howto/format1/installing_python.rst

@@ -35,7 +35,7 @@ Another good practice is to keep executable scripts very short,
 placing most of the code in a module which the script imports and then
 invokes::
 
-  #! /usr/bin/env python
+  #! /usr/bin/env python3
   import your_package.main
   if __name__ == '__main__':
       your_package.main()

doc/howto/format2/installing_python.rst

@@ -35,7 +35,7 @@ Another good practice is to keep executable scripts very short,
 placing most of the code in a module which the script imports and then
 invokes::
 
-  #! /usr/bin/env python
+  #! /usr/bin/env python3
   import your_package.main
   if __name__ == '__main__':
       your_package.main()

test/local_tests/test_with_mock_workspace.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import os
 import shutil

test/network_tests/test_unstable.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import os
 import shutil