TODO use a writer to get the command output

resulting appearance:
```
go-ipfs (feat/machine-readable-logging) λ. make install_2; ipfs2 init -f
cd cmd/ipfs2 && go install
initializing ipfs node at /Users/btc/.go-ipfs
generating key pair...
peer identity: %s QmcPLgrqfvnneJ3vr3oGpkTiS9Psx8p3HxevjnoZYToDRm
```

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>