[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/lib/xos-api/.gitignore b/lib/xos-api/.gitignore
index f82b325..b8cf076 100644
--- a/lib/xos-api/.gitignore
+++ b/lib/xos-api/.gitignore
@@ -1,3 +1,2 @@
-build
-xosapi/chameleon
-xosapi.egg-info
+# setup.py copies this, don't commit it
+xosapi/VERSION