Disable Eviction of flow in Vrouter

Vrouter will track tcp flags, but will not evict the flow
entry once the session is closed and let vrouter agent
look at the flag to delete the flow eventually.

This is required till vrouter agent handles evict event
in a more stable way

Partial-Bug: 1550759
Change-Id: Ic7074442b22fc2c11362274e4e390654f3f2400a

dp-core/vr_flow.c

@@ -810,8 +810,19 @@ vr_flow_action(struct vrouter *router, struct vr_flow_entry *fe,
         break;
     }
 
+    /*
+     * Eviction of Flow in vrouter add additional events to vrouter
+     * agent state machine making it complex and unstable, till
+     * agent is handling vrouter eviction appropriately, disabling
+     * eviction from vrouter.
+     * NOTE: Vrouter agent will look at VR_FLOW_TCP_DEAD flag to
+     * clear/evict flow immediately
+     * TODO(prabhjot): need to re-enable, after stablizing agent
+     */
+#if 0
     if (fe->fe_tcp_flags & VR_FLOW_TCP_DEAD)
         vr_flow_mark_evict(router, fe, index);
+#endif
 
     return result;
 }