drop more python2 support

setup.py

@@ -44,7 +44,6 @@ setup(name=name,
         'croniter', # needed to know cron schedule
         'pytz', # needed to manipulate timezone
         'tzlocal', # needed to manipulate timezone
-        'backports.lzma',
         'netifaces',
         'erp5.util',
         'PyRSS2Gen',
@@ -56,8 +55,7 @@ setup(name=name,
         'six',
         'cryptography',
         'click',
-        'websocket-client; python_version>="3"',
-        'ipaddress; python_version<"3"',
+        'websocket-client',
       ),
       extras_require = {
         'lampconfigure':  ["mysqlclient"], #needed for MySQL Database access

slapos/promise/check_slow_queries_digest_result/__init__.py

@@ -4,8 +4,6 @@
 Check if a mariadb result matches the desired threshold or raises an error.
 """
 
-from __future__ import print_function
-
 import json
 import os
 import re
@@ -13,7 +11,7 @@ import sys
 import time
 import datetime
 import argparse
-from backports import lzma
+import lzma
 
 def checkMariadbDigestResult(mariadbdex_path, mariadbdex_report_status_file,
                              max_query_threshold, slowest_query_threshold):

slapos/test/promise/test_check_slow_queries_digest_result.py

@@ -24,7 +24,6 @@
 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 #
 ##############################################################################
-from __future__ import unicode_literals
 import unittest
 import os
 import time
@@ -32,7 +31,7 @@ import tempfile
 import datetime
 import shutil
 import codecs
-from backports import lzma
+import lzma
 
 from . import data
 from slapos.promise.check_slow_queries_digest_result import checkMariadbDigestResult