Recommend Sphinx from Python 3 in documentation and packaging.

Acked-by: Numan Siddique <nusididq@redhat.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>

.travis.yml

@@ -20,7 +20,7 @@ addons:
       - libjemalloc1
       - libjemalloc-dev
       - libnuma-dev
-      - python-sphinx
+      - python3-sphinx
       - libelf-dev
       - selinux-policy-dev
       - libunbound-dev

Documentation/intro/install/documentation.rst

@@ -45,11 +45,11 @@ Sphinx. A detailed guide on installing Sphinx in many environments is available
 on the `Sphinx website`__ but, for most Linux distributions, you can install
 with your package manager. For example, on Debian/Ubuntu run::
 
-    $ sudo apt-get install python-sphinx
+    $ sudo apt-get install python3-sphinx
 
 Similarly, on RHEL/Fedora run::
 
-    $ sudo dnf install python-sphinx
+    $ sudo dnf install python3-sphinx
 
 A ``requirements.txt`` is also provided in the ``/Documentation``, should you
 wish to install using ``pip``::
@@ -71,7 +71,7 @@ available on the `Sphinx website`__.
 Building
 --------
 
-Once Sphinx installed, the documentation can be built using the provided
+Once Sphinx is installed, the documentation can be built using the provided
 Makefile targets::
 
     $ make docs-check

Documentation/intro/install/rhel.rst

@@ -89,7 +89,7 @@ And to install specific dependencies, use yum-builddep tool::
 
 Once that is completed, remove the file ``/tmp/ovs.spec``.
 
-If python-sphinx package is not available in your version of RHEL, you can
+If python3-sphinx package is not available in your version of RHEL, you can
 install it via pip with 'pip install sphinx'.
 
 Open vSwitch requires python 2.7 or newer which is not available in older

build-aux/dpdkstrip.py

@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 # Copyright (c) 2017 Red Hat, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");

rhel/openvswitch-fedora.spec.in

@@ -79,7 +79,7 @@ BuildRequires: python3-devel
 BuildRequires: desktop-file-utils
 BuildRequires: groff graphviz
 BuildRequires: checkpolicy, selinux-policy-devel
-BuildRequires: /usr/bin/sphinx-build
+BuildRequires: /usr/bin/sphinx-build-3
 # make check dependencies
 BuildRequires: %{_py2}-twisted%{?rhel:-core} %{_py2}-zope-interface %{_py2}-six
 BuildRequires: procps-ng

rhel/openvswitch.spec.in

@@ -37,7 +37,7 @@ BuildRequires: python-six
 BuildRequires: openssl-devel
 BuildRequires: checkpolicy, selinux-policy-devel
 BuildRequires: autoconf, automake, libtool
-BuildRequires: python-sphinx
+BuildRequires: python3-sphinx
 BuildRequires: unbound-devel
 
 %bcond_without check