Remove "resolver flushnet <netid>" command.

Change-Id: I117adc3c7e240597e7fd91c709898bbbbe988261
diff --git a/server/CommandListener.cpp b/server/CommandListener.cpp
index 6dc8485..37838a7 100644
--- a/server/CommandListener.cpp
+++ b/server/CommandListener.cpp
@@ -827,14 +827,6 @@
                     "Wrong number of arguments to resolver clearnetdns", false);
             return 0;
         }
-    } else if (!strcmp(argv[1], "flushnet")) { // "resolver flushnet <netId>"
-        if (argc == 3) {
-            rc = gCtls->resolverCtrl.flushDnsCache(netId);
-        } else {
-            cli->sendMsg(ResponseCode::CommandSyntaxError,
-                    "Wrong number of arguments to resolver flushnet", false);
-            return 0;
-        }
     } else {
         cli->sendMsg(ResponseCode::CommandSyntaxError,"Resolver unknown command", false);
         return 0;