Reduce sizes of etcd and orch VMs

Reduce sizes of etcd and orch VMs.  Also add one more
orch VM for resilience.

Change-Id: I8947e0fb6af7e788146e6a67f165b9dbc879dcf6
Issue-ID: INT-586
Signed-off-by: Gary Wu <gary.i.wu@huawei.com>
diff --git a/deployment/heat/onap-oom/env/windriver/onap-oom.env b/deployment/heat/onap-oom/env/windriver/onap-oom.env
index e69005e..873a6c4 100644
--- a/deployment/heat/onap-oom/env/windriver/onap-oom.env
+++ b/deployment/heat/onap-oom/env/windriver/onap-oom.env
@@ -7,8 +7,8 @@
 
   rancher_vm_flavor: m1.large
   k8s_vm_flavor: m1.xlarge
-  etcd_vm_flavor: m1.large
-  orch_vm_flavor: m1.large
+  etcd_vm_flavor: m1.medium
+  orch_vm_flavor: m1.medium
 
   public_net_id: 971040b2-7059-49dc-b220-4fab50cb2ad4