switch to python3

Signed-off-by: Jakub Sokołowski <jakub@status.im>

.travis.yml

@@ -4,7 +4,7 @@ dist: trusty
 sudo: required
 language: python
 python:
-  - "2.7.15"
+  - "3.6"
 env:
   - >
     DISTRIBUTION=ubuntu

library/mongodb_replication.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 
 # (c) 2015-2018, Sergei Antipov, 2GIS LLC
 #
@@ -156,7 +156,7 @@ host_type:
   type: string
   sample: "replica"
 '''
-import ConfigParser
+import configparser
 import ssl as ssl_lib
 import time
 from datetime import datetime as dtdatetime
@@ -287,7 +287,7 @@ def remove_host(module, client, host_name, timeout=180):
             time.sleep(5)
 
 def load_mongocnf():
-    config = ConfigParser.RawConfigParser()
+    config = configparser.RawConfigParser()
     mongocnf = os.path.expanduser('~/.mongodb.cnf')
 
     try:
@@ -296,7 +296,7 @@ def load_mongocnf():
           user=config.get('client', 'user'),
           password=config.get('client', 'pass')
         )
-    except (ConfigParser.NoOptionError, IOError):
+    except (configparser.NoOptionError, IOError):
         return False
 
     return creds

tests/scripts/before_install.sh

@@ -18,7 +18,7 @@ cat << EOF > ansible.cfg
 [defaults]
 pipelining = True
 strategy = mitogen_linear
-strategy_plugins = /home/travis/virtualenv/python2.7.15/lib/python2.7/site-packages/ansible_mitogen/plugins/strategy
+strategy_plugins = /home/travis/virtualenv/python3.6.9/lib/python3.6/site-packages/ansible_mitogen/plugins/strategy
 EOF
 
 # Pull docker image or build it