Enable linting for the repo

This change creates necessary configuration for running lint
against the changes sent to this repository. Outcomes of all
checks are currently disabled and they will be enabled once
the current issues are fixed.

Only yamllint is enabled as ansible-lint and shellcheck are
not applicable to the repo.

Change-Id: I2303aaaedff1d86a67c16468505824a2681113f5
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..86cb7cd
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,15 @@
+[tox]
+basepython = py36
+minversion = 2.5
+skipsdist = true
+envlist = yamllint
+install_command = pip install {opts} {packages}
+deps = -r{toxinidir}/test-requirements.txt
+
+[testenv:yamllint]
+# TODO: set ignore_outcome to false once issues are fixed
+ignore_outcome = true
+whitelist_externals = bash
+commands =
+  bash -c "find {toxinidir}/pods -type f -regex '.*.ya?ml' -print0 | \
+    xargs -t -n1 -0 yamllint --format standard --strict"