Enable warnings for python3 on scripts shebangs.

v2/bin/ansible

-#!/usr/bin/env python
+#!/usr/bin/env python -tt -3 -Wd
 
 # (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
 #
@@ -19,6 +19,17 @@
 
 ########################################################
 
+__requires__ = ['ansible']
+try:
+    import pkg_resources
+except Exception:
+    # Use pkg_resources to find the correct versions of libraries and set
+    # sys.path appropriately when there are multiversion installs.  But we
+    # have code that better expresses the errors in the places where the code
+    # is actually used (the deps are optional for many code paths) so we don't
+    # want to fail here.
+    pass
+
 import os
 import sys
 

v2/bin/ansible-playbook

-#!/usr/bin/env python
+#!/usr/bin/env python -tt -3 -Wd
+
+# (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
+#
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+
+########################################################
 from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
+__requires__ = ['ansible']
+try:
+    import pkg_resources
+except Exception:
+    # Use pkg_resources to find the correct versions of libraries and set
+    # sys.path appropriately when there are multiversion installs.  But we
+    # have code that better expresses the errors in the places where the code
+    # is actually used (the deps are optional for many code paths) so we don't
+    # want to fail here.
+    pass
+
 import os
 import stat
 import sys

v2/bin/ansible-vault

-#!/usr/bin/env python
+#!/usr/bin/env python -tt -3 -Wd
 
 # (c) 2014, James Tanner <tanner.jc@gmail.com>
 #