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/gomote/create.go b/cmd/gomote/create.go
index 31806af..290ce61 100644
--- a/cmd/gomote/create.go
+++ b/cmd/gomote/create.go
@@ -15,8 +15,8 @@
 	"strings"
 	"time"
 
-	"golang.org/x/tools/dashboard"
-	"golang.org/x/tools/dashboard/buildlet"
+	"golang.org/x/build/buildlet"
+	"golang.org/x/build/dashboard"
 )
 
 func create(args []string) error {