Remove unicode literal from code

All strings are considered as unicode literal string from Python 3.

This patch drops the explicit unicode literal (u'...')
appearances from the unicode strings.

Change-Id: I71621b95c87e7c10e86d8341173967235912053d
diff --git a/doc/source/conf.py b/doc/source/conf.py
index 4b4189d..2349713 100755
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -36,7 +36,7 @@
 master_doc = 'index'
 
 # General information about the project.
-copyright = u'2017, OpenStack Developers'
+copyright = '2017, OpenStack Developers'
 
 # openstackdocstheme options
 openstackdocs_repo_name = 'openstack/neutron-tempest-plugin'
@@ -71,8 +71,8 @@
 latex_documents = [
     ('index',
      'openstack.tex',
-     u'openstack Documentation',
-     u'OpenStack Developers', 'manual'),
+     'openstack Documentation',
+     'OpenStack Developers', 'manual'),
 ]
 
 # Example configuration for intersphinx: refer to the Python standard library.