cmd/coordinator: generate table of builders

To replace the always-out-of-date wiki.

Change-Id: I63d56d4bcf9252e56c833eaa15656b0321ac91dc
Reviewed-on: https://go-review.googlesource.com/9571
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/dashboard/builders.go b/dashboard/builders.go
index 689e954..7c7f280 100644
--- a/dashboard/builders.go
+++ b/dashboard/builders.go
@@ -120,6 +120,14 @@
 	return "n1-highcpu-2"
 }
 
+// ShortOwner returns a short human-readable owner.
+func (c BuildConfig) ShortOwner() string {
+	if c.Owner == "" {
+		return "go-dev"
+	}
+	return strings.TrimSuffix(c.Owner, "@golang.org")
+}
+
 func init() {
 	addBuilder(BuildConfig{
 		Name:        "freebsd-amd64-gce93",