Add setup of a pip virtualenv for kubespray use

Don't use incorrectly setup local provisioner that ships with kubespray,
and fix integration breakage with 1.10

Change-Id: Idf6019ef03afca9e47e75748cefd9a067b19d48c
diff --git a/kubespray-installer/.gitignore b/kubespray-installer/.gitignore
index b032f2b..a608ac6 100644
--- a/kubespray-installer/.gitignore
+++ b/kubespray-installer/.gitignore
@@ -1,3 +1,5 @@
 kubespray
 inventories
 *.retry
+ks_venv
+