Turn on featcher.xmlrpc and use pyspider all --fetcher-num 2 to cause port conflicts.

[snail-lb]

• pyspider version: 0.3.10
• Operating system: win10
• Start up command: pyspider --config ./pyspider/pyspider.json all --fetcher-num 2

pyspider.json:

{
    "fetcher": {
        "xmlrpc": true
    }
}

Expected behavior

Start 2 fetcher threads with the all command.

Actual behavior

fetcher.xmlrpc_run also started two, causing port conflicts.

How to reproduce

Turn on fetcher.xmlrpc, use all to start the program, set fetcher-num=2, which will cause this problem.