refactor: Deflake and Try package

- feat: add CI multiplier
- refactor: readability
- feat: custom Sleep function
- refactor(integration): use custom Sleep
- feat: show Try progress
- feat(try): try response with status code
- refactor(try): use a dedicate package.
- refactor(integration): Try everywhere
- feat(CI): pass CI env var to Integration Tests.
- refactor(acme): increase timeout.
- feat(acme): show Traefik logs
- refactor(integration): use `http.StatusXXX`
- refactor: remove Sleep

integration/file_test.go

@@ -5,8 +5,8 @@ import (
 	"os/exec"
 	"time"
 
+	"github.com/containous/traefik/integration/try"
 	"github.com/go-check/check"
-
 	checker "github.com/vdemeester/shakers"
 )
 
@@ -25,12 +25,9 @@ func (s *FileSuite) TestSimpleConfiguration(c *check.C) {
 	c.Assert(err, checker.IsNil)
 	defer cmd.Process.Kill()
 
-	time.Sleep(1000 * time.Millisecond)
-	resp, err := http.Get("http://127.0.0.1:8000/")
-
 	// Expected a 404 as we did not configure anything
+	try.GetRequest("http://127.0.0.1:8000/", 1000*time.Millisecond, try.StatusCodeIs(http.StatusNotFound))
 	c.Assert(err, checker.IsNil)
-	c.Assert(resp.StatusCode, checker.Equals, 404)
 }
 
 // #56 regression test, make sure it does not fail
@@ -40,10 +37,7 @@ func (s *FileSuite) TestSimpleConfigurationNoPanic(c *check.C) {
 	c.Assert(err, checker.IsNil)
 	defer cmd.Process.Kill()
 
-	time.Sleep(1000 * time.Millisecond)
-	resp, err := http.Get("http://127.0.0.1:8000/")
-
 	// Expected a 404 as we did not configure anything
+	try.GetRequest("http://127.0.0.1:8000/", 1000*time.Millisecond, try.StatusCodeIs(http.StatusNotFound))
 	c.Assert(err, checker.IsNil)
-	c.Assert(resp.StatusCode, checker.Equals, 404)
 }