initial delivery of system test framework

- add initial pytest framework with fixtures for
  vim, openstack, osm
- test cirros and ping_pong ns available from repo

Change-Id: Iae1fa4bcbf55fb8bc6986e798fd662a0bd452470
Signed-off-by: Mike Marchetti <mmarchetti@sandvine.com>
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d9a3498
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.pyc
+.cache