Installer: Refactor and give each searver its own directory

Change-Id: I1db2929e7a35b6f92022dec0c6506d68e0297563
diff --git a/core/installer/cmd/env_manager.go b/core/installer/cmd/env_manager.go
index c0ea8e8..483211e 100644
--- a/core/installer/cmd/env_manager.go
+++ b/core/installer/cmd/env_manager.go
@@ -8,9 +8,9 @@
 	"github.com/giolekva/pcloud/core/installer"
 	"github.com/giolekva/pcloud/core/installer/dns"
 	"github.com/giolekva/pcloud/core/installer/http"
+	"github.com/giolekva/pcloud/core/installer/server/env"
 	"github.com/giolekva/pcloud/core/installer/soft"
 	"github.com/giolekva/pcloud/core/installer/tasks"
-	"github.com/giolekva/pcloud/core/installer/welcome"
 )
 
 var envManagerFlags struct {
@@ -82,7 +82,7 @@
 		return err
 	}
 	httpClient := http.NewClient()
-	s := welcome.NewEnvServer(
+	s := env.NewEnvServer(
 		envManagerFlags.port,
 		ss,
 		repoIO,