set missing logger on switch
set missing logger on switch

```
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x882cec]

goroutine 328 [running]:
github.com/tendermint/tendermint/p2p.(*Switch).DialPeerWithAddress(0xc42000a500, 0xc4202088d0, 0xc420403500, 0x0, 0x0, 0x0)
        /home/vagrant/go/src/github.com/tendermint/tendermint/p2p/switch.go:324 +0x2fc
github.com/tendermint/tendermint/p2p.(*PEXReactor).ensurePeers.func1(0xc4201663f0, 0xc4202088d0)
        /home/vagrant/go/src/github.com/tendermint/tendermint/p2p/pex_reactor.go:280 +0x3e
created by github.com/tendermint/tendermint/p2p.(*PEXReactor).ensurePeers
        /home/vagrant/go/src/github.com/tendermint/tendermint/p2p/pex_reactor.go:284 +0x5d4
```

tendermint/tendermint,tendermint/tendermint,tendermint/tendermint,tendermint/tendermint