Add variable for version of rancher server

Rancher server version is hardcoded to 1.6.14 used in Beijing
deployment. This limits flexibility to use it for future
versions of ONAP deployments.

This change adds possibility to choose version of rancher server via
variable in group_vars/infrastructure.yml and setting its default
value to version used by Casablanca release.

Change-Id: I3a38a882386ce6adcba77780ee79a7cedfe98e4e
Issue-ID: OOM-1584
Signed-off-by: Milan Verespej <m.verespej@partner.samsung.com>
diff --git a/ansible/group_vars/infrastructure.yml b/ansible/group_vars/infrastructure.yml
index ab31405..29e6edc 100755
--- a/ansible/group_vars/infrastructure.yml
+++ b/ansible/group_vars/infrastructure.yml
@@ -26,6 +26,7 @@
 all_simulated_hosts:
     "{{ simulated_hosts.git + simulated_hosts.http + simulated_hosts.nexus }}"
 rancher_server_url: "http://{{ hostvars[groups.infrastructure.0].ansible_host }}:8080"
+rancher_server_version: v1.6.22
 rancher_remove_other_env: yes
 rancher_redeploy_k8s_env: yes
 populate_nexus: no