parametrized disable_flow_collection for disable flow collection at vrouter 2.2X
diff --git a/opencontrail/files/2.2/contrail-vrouter-agent.conf b/opencontrail/files/2.2/contrail-vrouter-agent.conf
index 4ff305a..3b6e9af 100644
--- a/opencontrail/files/2.2/contrail-vrouter-agent.conf
+++ b/opencontrail/files/2.2/contrail-vrouter-agent.conf
@@ -51,6 +51,7 @@
# Disable sending of flow samples to collector. Possible values are 0 and 1
# disable_flow_collection=false
+disable_flow_collection={{ compute.get('disable_flow_collection', 'false') }}
# Encapsulation type for tunnel. Possible values are MPLSoGRE, MPLSoUDP, VXLAN
# tunnel_type=