Fix error in BGP Confederation syntax

Sorry about this, I had forgot that TOML subtables require the name of the parent table in their path's. I've validated this configuration:

```
root@kkirsche-dev:/home/kkirsche# ./gobgpd -f config.toml
{"level":"info","msg":"gobgpd started","time":"2019-08-28T18:32:23Z"}
{"Topic":"Config","level":"info","msg":"Finished reading the config file","time":"2019-08-28T18:32:23Z"}
{"level":"info","msg":"Peer 10.0.0.2 is added","time":"2019-08-28T18:32:23Z"}
{"Topic":"Peer","level":"info","msg":"Add a peer configuration for:10.0.0.2","time":"2019-08-28T18:32:23Z"}
```

```
root@kkirsche-dev:# cat config.toml
[global]
  [global.config]
    as = 65001
    router-id = "10.0.0.1"
  [global.confederation.config]
    enabled = true
    identifier = 30
    member-as-list = [ 65002 ]
```

0 files changed, 0 insertions, 0 deletions