need new rpc command .. addnode <ip> remove .. does not remove from dns list as well as persistent list

[toddfries]

104939 <@davec> ok so it's only looking in peers that we added
104950 <@davec> actually I think it's persistent peers in general
104952 < todd> the getpeerinfo rpc command can list all peers regardless of rpc list or dns list
105011 < todd> but the rpc 'addnode <ip> remove' cannot remove something from the dns list, only the rpc list
105036 <@davec> right    case delNodeMsg:
105036 < todd> so from what you said, 's/rpc list/persistent list/'
105036 <@davec>         found := false
105037 <@davec>         for e := state.persistentPeers.Front(); e != nil; e = e.Next() {
105044 <@davec> yep, that's wrong
105048 <@davec> ticket please
...
111339 <@davec> todd: oga just informed me that addnode is only *supposed* to work on persistent peers to be compatible with bitcoind
111410 <@davec> I rather agree that isn't very smart, but I guess we'll just provide an extension command that does it
111432 <@davec> not being able to remove any connection doesn't make sense

[davecgh]

This will be implemented via the new node command once #341 is merged.