Add tox.ini

This change adds a tox.ini file so it is possible to launch all the
tests by running `tox`. Note that to launch the Puppet tests, bundler
[1] needs to be installed.

[1] http://bundler.io/

Change-Id: I86013f60d67b338188840bd632d1d5b00ff6dd99

tox.ini

@@ -0,0 +1,12 @@
+[tox]
+envlist = lma_logging_analytics
+skipsdist = True
+
+[testenv:lma_logging_analytics]
+deps =
+changedir = {toxinidir}/deployment_scripts/puppet/modules/{envname}
+whitelist_externals = bundle
+commands =
+    bundle install
+    bundle exec rake test
+