teamd: Use 75% links upperbound as min-links (#224)

Author: taoyl-ms

dockers/docker-teamd/teamd.j2

@@ -3,7 +3,8 @@
     "runner": {
         "name": "lacp",
         "active": true,
-        "min_ports": 2,
+{# Use 75% links upperbound as min-links #}
+        "min_ports": {{ minigraph_portchannel_interfaces[pc] | length * 0.75 | round(0, 'ceil') | int}},
         "tx_hash": ["eth", "ipv4", "ipv6"]
     },
     "link_watch": {