[CORD-2943] Update kubespray to 2.5, kubernetes to 1.9.5

Change-Id: I23515605160cc5036cbf308474a21f89ed3483c6
diff --git a/ansible/roles/prep-kubespray/defaults/main.yml b/ansible/roles/prep-kubespray/defaults/main.yml
index ba1c7a9..57e0818 100644
--- a/ansible/roles/prep-kubespray/defaults/main.yml
+++ b/ansible/roles/prep-kubespray/defaults/main.yml
@@ -15,7 +15,7 @@
 
 # prep-kubespray/defaults/main.yml
 
-kubespray_version: "master"
+kubespray_version: "v2.5.0"
 kubespray_dir: "{{ 'kubespray' | realpath }}"
 
 management_net_cidr: "10.1.0.0/24"