[PortsOrch] Add reference counting to ports for ACL bindings (sonic-n…

…et#1614)

What I did:
Use reference count for protect interface, If interface bind to ACL the reference will increase and vice versa.

Why I did it:
If interface bind to ACL and remove LAG causes the ACL rule become global rule
to match all interfaces.

How I verified it:
Run the pytest check ACL and Port test case passed.

orchagent/portsorch.cpp

@@ -1247,6 +1247,13 @@ bool PortsOrch::unbindAclTable(sai_object_id_t  port_oid,
         return false;
     }
 
+
+    Port port;
+    if (getPort(port_oid, port))
+    {
+        decreasePortRefCount(port.m_alias);
+    }
+
     if (!unbindRemoveAclTableGroup(port_oid, acl_table_oid, acl_stage)) {
         return false;
     }
@@ -1307,6 +1314,12 @@ bool PortsOrch::bindAclTable(sai_object_id_t  port_oid,
         return false;
     }
 
+    Port port;
+    if (getPort(port_oid, port))
+    {
+        increasePortRefCount(port.m_alias);
+    }
+
     return true;
 }