Add multiple entry points support

[emilevauge]

This PR adds multiple entry points support to traefik, aka, traefik can now listens on http and https :)
This PR also add entry point redirection.

Simple entrypoint definition:

[entryPoints]
  [entryPoints.http]
  address = ":80"

To redirect an http entrypoint to an https entrypoint (with SNI support):

[entryPoints]
  [entryPoints.http]
  address = ":80"
    [entryPoints.http.redirect]
      entryPoint = "https"
  [entryPoints.https]
  address = ":443"
    [entryPoints.https.tls]
      [[entryPoints.https.tls.certificates]]
      CertFile = "integration/fixtures/https/snitest.com.cert"
      KeyFile = "integration/fixtures/https/snitest.com.key"
      [[entryPoints.https.tls.certificates]]
      CertFile = "integration/fixtures/https/snitest.org.cert"
      KeyFile = "integration/fixtures/https/snitest.org.key"

To redirect an entrypoint rewriting the URL:

[entryPoints]
  [entryPoints.http]
  address = ":80"
    [entryPoints.http.redirect]
      regex = "^http://localhost/(.*)"
      replacement = "http://mydomain/$1"

Entrypoints to be used by frontends that do not specify any entrypoint:

defaultEntryPoints = ["http", "https"]

Frontends can overrides defaultEntryPoints:

[frontends]
  [frontends.frontend1]
  backend = "backend2"
    [frontends.frontend1.routes.test_1]
    rule = "Host"
    value = "test.localhost"
  [frontends.frontend2]
  backend = "backend1"
  passHostHeader = true
  entrypoints = ["https"] # overrides defaultEntryPoints
    [frontends.frontend2.routes.test_1]
    rule = "Host"
    value = "{subdomain:[a-z]+}.localhost"
  [frontends.frontend3]
  entrypoints = ["http", "https"] # overrides defaultEntryPoints
  backend = "backend2"
    rule = "Path"
    value = "/test"

• multiple entry points
• redirection
• providers
• documentation

Fixes #113 and some of #61

[dontrebootme]

Wow, multiple entrypoints and redirection configuration? This looks great!

[emilevauge]

@rebaseTraefik

[rebaseTraefik]

I just pushed up the changes, enjoy!

[vdemeester]

@rebaseTraefik

[rebaseTraefik]

I just pushed up the changes, enjoy!

[vdemeester]

One line up 👼

[emilevauge]

Fixed and rebased.
If you don't have any better idea regarding the ugly regex, let's merge it then. Will find a better way to manage args later.

[vdemeester]

@rebaseTraefik

[rebaseTraefik]

I could not rebase add-multiple-entrypoints-support with master. There are conflicts.

[rogierlommers]

Sorry to bump, but I'm having a hard time to create a frontend (only a frontend) which redirects traffic from abc.com to xyz.com. Can someone please point me to some examples?

[traefiker]

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