listplugins is inconsistent with plugins command

[cloud8little]

Describe the bug listplugins when RpcServer is installed.

To Reproduce Steps to reproduce the behavior:

1. Install RpcServer, ApplicationLogs, LevelDBStore and RpcNep5Tracker
2. Start the node
3. call listplugins request, and input plugins in the command.

in neo-cli,

Loaded plugins:
        ApplicationLogs Synchronizes the smart contract log with the NativeContract log (Notify)
        LevelDBStore    Uses LevelDB to store the blockchain data
        RpcNep5Tracker  Enquiries NEP-5 balances and transaction history of accounts through RPC
        RpcServer       Enables RPC for the node

listplugins response:

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": [
    {
      "name": "ApplicationLogs",
      "version": "3.0.0.0",
      "interfaces": [
        "IPersistencePlugin"
      ]
    },
    {
      "name": "LevelDBStore",
      "version": "3.0.0.0",
      "interfaces": []
    },
    {
      "name": "RpcNep5Tracker",
      "version": "3.0.0.0",
      "interfaces": [
        "IPersistencePlugin"
      ]
    },
    {
      "name": "RpcServer",
      "version": "3.0.0.0",
      "interfaces": []
    },
    {
      "name": "SystemLog",
      "version": "3.0.0.0",
      "interfaces": [
        "ILogPlugin"
      ]
    }
  ]
}

Expected behavior:

1. SystemLog should not show.
2. interfaces for RpcServer should not be empty.

Platform:

• OS: Windows 10 x64
• Version preview3