Add SqlAuthUser and LdapAuthUser auth classes. Deprecate the usage of SqlAuthUser in favor of SqlAuthUser.

SqlAuthUser use django databases management, and thus is compatible with all SQL databases supported
by django: postgresql, mysql, sqlite3 and oracle.

LdapAuthUser use the full pythonic ldap3 module

cas_server/utils.py

@@ -582,7 +582,7 @@ def check_password(method, password, hashed_password, charset):
         :param hashed_password: The hashed password as stored in the database
         :type hashed_password: :obj:`str` or :obj:`unicode`
         :param str charset: The used char encoding (also used internally, so it must be valid for
-            the charset used by ``password`` even if it is inputed as an :obj:`unicode`)
+            the charset used by ``password`` when it was initially )
         :return: True if ``password`` match ``hashed_password`` using ``method``,
             ``False`` otherwise
         :rtype: bool
@@ -670,3 +670,12 @@ def last_version():
                 "Unable to fetch %s: %s" % (settings.CAS_NEW_VERSION_JSON_URL, error)
             )
             last_version._cache = (time.time(), version, False)
+
+
+def dictfetchall(cursor):
+    "Return all rows from a django cursor as a dict"
+    columns = [col[0] for col in cursor.description]
+    return [
+        dict(zip(columns, row))
+        for row in cursor.fetchall()
+    ]