Change the following to replace Python 2 code with Python 3:

1) Replace the deprecated unit test method.
2) Wraps filter usage in a list call.
3) Converts the old metaclass syntax to new.
4) Use range instead of xrange method.
5) Change Unicode to str.
6) Several other transformations.
7) Fixed change password test cases.
8) Use simplejson instead of plain JSON.

docs/en_US/conf.py

@@ -208,8 +208,8 @@ htmlhelp_basename = 'pgadmin4'
 # (source start file, target name, title, author, documentclass
 # [howto/manual]).
 latex_documents = [
-    ('index', 'pgadmin4.tex', u'pgAdmin 4 Documentation',
-     u'The pgAdmin Development Team', 'manual'),
+    ('index', 'pgadmin4.tex', 'pgAdmin 4 Documentation',
+     'The pgAdmin Development Team', 'manual'),
 ]
 
 # The name of an image file (relative to this directory) to place at the top of
@@ -247,6 +247,6 @@ latex_elements = {
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
 man_pages = [
-    ('index', 'pgadmin4', u'pgAdmin 4 Documentation',
-     [u'The pgAdmin Development Team'], 1)
+    ('index', 'pgadmin4', 'pgAdmin 4 Documentation',
+     ['The pgAdmin Development Team'], 1)
 ]