Update import paths after move from tools repo

Also:
- Move the watcher to cmd/watcher (somehow this was missed earlier).
- Move dashboard package from the repo root to its own directory.
- Update docker build scripts. (Although not yet the version hashes in
  the Dockerfiles; this leaves the docker builds broken, but they were
  already broken after moving the builder to cmd/builder. They'll be
  fixed in a followup CL after this one is submitted.)

Change-Id: I29a9758da1f3c60446e3ce18174c0df26e4d8325
Reviewed-on: https://go-review.googlesource.com/3077
Reviewed-by: Andrew Gerrand <adg@golang.org>
diff --git a/cmd/coordinator/coordinator.go b/cmd/coordinator/coordinator.go
index 900b848..e94ceca 100644
--- a/cmd/coordinator/coordinator.go
+++ b/cmd/coordinator/coordinator.go
@@ -5,7 +5,7 @@
 // +build extdep
 
 // The coordinator runs on GCE and coordinates builds in Docker containers.
-package main // import "golang.org/x/tools/dashboard/cmd/coordinator"
+package main // import "golang.org/x/build/cmd/coordinator"
 
 import (
 	"archive/tar"
@@ -33,11 +33,11 @@
 	"sync"
 	"time"
 
+	"golang.org/x/build/buildlet"
+	"golang.org/x/build/dashboard"
+	"golang.org/x/build/types"
 	"golang.org/x/oauth2"
 	"golang.org/x/oauth2/google"
-	"golang.org/x/tools/dashboard"
-	"golang.org/x/tools/dashboard/buildlet"
-	"golang.org/x/tools/dashboard/types"
 	"google.golang.org/api/compute/v1"
 	"google.golang.org/cloud/compute/metadata"
 )