rpc_server::stop doesnot stop its service

[laomd]

Describe the bug
routes_.stop() is not called in rpc_server::stop()

[emaxerrno]

oh good point. @laomd please see our CONTRIBUTING.md and submit a quick patch. should be fairly easy.

[emaxerrno]

hi @laomd i saw you sent a patch on the mailing list yesterday, I'll get to it this weekend/tom.