Reduce DCAE VM flavors

Previously all DCAE VMs are overprovisioned as m1.xlarge.  Reduce to
m1.large for Hadoop cluster VMs and m1.medium for other VMs.

Issue-ID: INT-375
Change-Id: Icd58a3d9089c4da40ca906d50cbf5d4fd4ca74d4
Signed-off-by: Lusheng Ji <lji@research.att.com>

heat/ONAP/onap_openstack.yaml

@@ -1647,8 +1647,8 @@ resources:
             __dcaeos_public_network_name__: { get_param: public_net_name }
             __dcaeos_ubuntu_1604_image__: { get_param: ubuntu_1604_image }
             __dcaeos_centos_7_image__: { get_param: dcae_centos_7_image }
-            __dcaeos_flavor_id__: { get_param: flavor_xlarge }
-            __dcaeos_flavor_id_cdap__: { get_param: flavor_xlarge }
+            __dcaeos_flavor_id__: { get_param: flavor_medium }
+            __dcaeos_flavor_id_cdap__: { get_param: flavor_large }
             __dcaeos_dnsaas_config_enabled__: { get_param: dnsaas_config_enabled }
             __dcaeos_dnsaas_region__: { get_param: dnsaas_region }
             __dcaeos_dnsaas_keystone_url__: { get_param: dnsaas_keystone_url }