[ovs-git] [openvswitch/ovs] 197c21: Documentation: Fix building with Python 3.9

[Timothy Redaelli]

  Branch: refs/heads/master
  Home:   https://github.com/openvswitch/ovs
  Commit: 197c21a63de06c0804801bb9ee674b88a7dfe08d
      https://github.com/openvswitch/ovs/commit/197c21a63de06c0804801bb9ee674b88a7dfe08d
  Author: Timothy Redaelli <tredaelli at redhat.com>
  Date:   2020-01-16 (Thu, 16 Jan 2020)

  Changed paths:
    M Documentation/conf.py

  Log Message:
  -----------
  Documentation: Fix building with Python 3.9

open(), io.open(), codecs.open() and fileinput.FileInput no longer accept 'U'
("universal newline") in the file mode.
This flag was deprecated since Python 3.3.
In Python 3, the "universal newline" is used by default when a file is open
in text mode.

Acked-by: Flavio Leitner <fbl at sysclose.org>
Reported-at: https://bugzilla.redhat.com/1791681
Reported-by: Miro Hrončok <mhroncok at redhat.com>
Signed-off-by: Timothy Redaelli <tredaelli at redhat.com>
Signed-off-by: Ben Pfaff <blp at ovn.org>