[SEBA-450] (part 2)

Add tox testing support on additional XOS library modules:

- xos-api
- xos-kafka (has no tests)
- xos-migrate (has no tests)
- xos-synchronizer

Change-Id: I98195bc9747971d3515882d517affe058dd86ac5
diff --git a/scripts/xos_dev_reqs.txt b/scripts/xos_dev_reqs.txt
index ff3c3ac..ad15a6c 100644
--- a/scripts/xos_dev_reqs.txt
+++ b/scripts/xos_dev_reqs.txt
@@ -21,3 +21,4 @@
 django-extensions==2.1.5
 djangorestframework==3.9.1
 flake8==3.7.5
+python-consul~=1.1.0