python: Fixup python shebangs to python3.

Builds on RHEL 8.2 systems are failing due to this issue.

See [1] as to why this is necessary.

I used the following command to identify files that need this fix:
find . -type f -executable | /usr/lib/rpm/redhat/brp-mangle-shebangs

I also updated the copyright notices as needed.

1. https://fedoraproject.org/wiki/Changes/Make_ambiguous_python_shebangs_error

Fixes: 1ca0323e7c ("Require Python 3 and remove support for Python 2.")
Signed-off-by: Greg Rose <gvrose8192@gmail.com>
Acked-by: Aaron Conole <aconole@redhat.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

ofproto/ipfix-gen-entities

@@ -1,6 +1,6 @@
-#! /usr/bin/env python
+#!/usr/bin/env python3
 #
-# Copyright (C) 2012 Nicira, Inc.
+# Copyright (C) 2012, 2020 Nicira, Inc.
 #
 # Copying and distribution of this file, with or without modification,
 # are permitted in any medium without royalty provided the copyright

ovsdb/dot2pic

@@ -1,6 +1,6 @@
-#! /usr/bin/env python
+#!/usr/bin/env python3
 
-# Copyright (c) 2009, 2010, 2011, 2013, 2017 Nicira, Inc.
+# Copyright (c) 2009, 2010, 2011, 2013, 2017, 2020 Nicira, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

ovsdb/ovsdb-doc

@@ -1,6 +1,6 @@
-#! /usr/bin/python
+#!/usr/bin/python3
 
-# Copyright (c) 2010, 2011, 2012, 2013, 2014, 2015 Nicira, Inc.
+# Copyright (c) 2010, 2011, 2012, 2013, 2014, 2015, 2020 Nicira, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

python/build/soutil.py

@@ -1,6 +1,6 @@
-#! /usr/bin/env python
+#!/usr/bin/env python3
 
-# Copyright (c) 2008, 2017 Nicira, Inc.
+# Copyright (c) 2008, 2017, 2020 Nicira, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

tests/ovsdb-monitor-sort.py

@@ -1,4 +1,17 @@
-#! /usr/bin/env python
+#!/usr/bin/env python3
+# Copyright (c) 2020 VMware, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 
 # Breaks lines read from stdin into groups using blank lines as
 # group separators, then sorts lines within the groups for

tests/sendpkt.py

@@ -1,6 +1,6 @@
-#! /usr/bin/env python
+#!/usr/bin/env python3
 
-# Copyright (c) 2018 VMware, Inc.
+# Copyright (c) 2018, 2020 VMware, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

tests/test-l7.py

@@ -1,5 +1,5 @@
-#!/usr/bin/env python
-# Copyright (c) 2015, 2016 Nicira, Inc.
+#!/usr/bin/env python3
+# Copyright (c) 2015, 2016, 2020 Nicira, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

tests/uuidfilt.py

@@ -1,4 +1,20 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
+# Copyright (c) 2020 VMware, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# Breaks lines read from stdin into groups using blank lines as
+# group separators, then sorts lines within the groups for
+# reproducibility.
 
 import re
 import sys

utilities/ovs-dev.py

@@ -1,5 +1,5 @@
-#!/usr/bin/env python
-# Copyright (c) 2013, 2014, 2015, 2016 Nicira, Inc.
+#!/usr/bin/env python3
+# Copyright (c) 2013, 2014, 2015, 2016, 2020 Nicira, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

utilities/ovs-pipegen.py

@@ -1,5 +1,5 @@
-#! /usr/bin/env python
-# Copyright (c) 2013, 2014, 2015 Nicira, Inc.
+#! /usr/bin/env python3
+# Copyright (c) 2013, 2014, 2015, 2020 Nicira, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

xenserver/etc_xapi.d_plugins_openvswitch-cfg-update

@@ -1,10 +1,10 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # xapi plugin script to update the cache of configuration items in the
 # ovs-vswitchd configuration that are managed in the xapi database when
 # integrated with Citrix management tools.
 
-# Copyright (C) 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
+# Copyright (C) 2009, 2010, 2011, 2012, 2013, 2020 Nicira, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

xenserver/opt_xensource_libexec_interface-reconfigure

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright (c) 2008,2009 Citrix Systems, Inc.
 #

xenserver/usr_share_openvswitch_scripts_ovs-xapi-sync

@@ -1,5 +1,5 @@
-#! /usr/bin/env python
-# Copyright (c) 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
+#!/usr/bin/env python3
+# Copyright (c) 2009, 2010, 2011, 2012, 2013, 2020 Nicira, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.