RO-4367 Update master third-party dependencies

This change is the result of running gating/update_dependencies/*
  See update_dependencies in https://rpc-openstack.atlassian.net/wiki/spaces/RE/pages/19005457/RE+for+Projects for more details.

Author: rpc.jenkins.cit.rackspace.net

upper-constraints.txt

@@ -39,7 +39,7 @@ mccabe===0.4.0
 enum34===1.1.6
 flake8===2.5.5
 packaging===19.0
-py===1.7.0
+py===1.8.0
 testtools===2.3.0
 Parsley===1.3
 linecache2===1.0.0
@@ -59,10 +59,10 @@ dulwich===0.19.11
 pep8===1.7.1
 GitPython===2.1.11
 ndg-httpsclient===0.5.1
-cffi===1.11.5
+cffi===1.12.1
 Babel===2.6.0
 smmap2===2.0.5
 filelock===3.0.10
 gitdb2===2.0.5
-virtualenv===16.3.0
+virtualenv===16.4.0
 pytz===2018.9