[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-kafka/tox.ini b/lib/xos-kafka/tox.ini
new file mode 100644
index 0000000..cec6c72
--- /dev/null
+++ b/lib/xos-kafka/tox.ini
@@ -0,0 +1,43 @@
+; Copyright 2019-present Open Networking Foundation
+;
+; Licensed under the Apache License, Version 2.0 (the "License");
+; you may not use this file except in compliance with the License.
+; You may obtain a copy of the License at
+;
+; http://www.apache.org/licenses/LICENSE-2.0
+;
+; Unless required by applicable law or agreed to in writing, software
+; distributed under the License is distributed on an "AS IS" BASIS,
+; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+; See the License for the specific language governing permissions and
+; limitations under the License.
+
+[tox]
+envlist = py27,py35,py36,py37
+skip_missing_interpreters = true
+
+[testenv]
+deps =
+  -r requirements.txt
+  nose2
+  flake8
+
+commands =
+  nose2 -c tox.ini --verbose --junit-xml
+  flake8
+
+[flake8]
+max-line-length = 119
+
+[unittest]
+plugins=nose2.plugins.junitxml
+
+[junit-xml]
+path=nose2-results.xml
+
+[coverage]
+always-on = True
+coverage = xoskafka
+coverage-report =
+  xml
+  term