Refactor traefik with package

Split a bit traefik into package. The idea behind this refactor is to
start move inter-dependencies away and do some DRY or SRP.

- Adds a `provider` package, with providers except `web.go`
- Adds a `types` package with common struct.
- Move `gen.go` to an `autogen` package

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

consul.go

@@ -1,14 +0,0 @@
-package main
-
-type ConsulProvider struct {
-	Watch      bool
-	Endpoint   string
-	Prefix     string
-	Filename   string
-	KvProvider *KvProvider
-}
-
-func (provider *ConsulProvider) Provide(configurationChan chan<- configMessage) error {
-	provider.KvProvider = NewConsulProvider(provider)
-	return provider.KvProvider.provide(configurationChan)
-}