[task scheduler] Move files from build_scheduler/ to task_scheduler/

task_scheduler/go/parse_task_cfg/main.go

 package main
 
 /*
         Convenience program for verification of task config files.
 */
 
 import (
         "flag"
         "io/ioutil"
 
         "github.com/skia-dev/glog"
-        "go.skia.org/infra/build_scheduler/go/task_scheduler"
         "go.skia.org/infra/go/common"
+        "go.skia.org/infra/task_scheduler/go/scheduling"
 )
 
 var (
         cfgFile = flag.String("cfg_file", "", "Config file to parse.")
 )
 
 func main() {
         common.Init()
         defer common.LogPanic()
 
         b, err := ioutil.ReadFile(*cfgFile)
         if err != nil {
                 glog.Fatal(err)
         }
-        if _, err := task_scheduler.ParseTasksCfg(string(b)); err != nil {
+        if _, err := scheduling.ParseTasksCfg(string(b)); err != nil {
                 glog.Fatal(err)
         }
 }