cmd/gerritbot, cmd/gitmirror, maintner/maintnerd: add xerrors repo

Change-Id: Ia8faffb0c496dfbef7643cf2046d38103d1804bf
Reviewed-on: https://go-review.googlesource.com/c/159738
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
diff --git a/cmd/gerritbot/gerritbot.go b/cmd/gerritbot/gerritbot.go
index 23078eb..596de0d 100644
--- a/cmd/gerritbot/gerritbot.go
+++ b/cmd/gerritbot/gerritbot.go
@@ -223,6 +223,7 @@
 	"tour":           true,
 	"vgo":            true,
 	"website":        true,
+	"xerrors":        true,
 }
 
 type cachedPullRequest struct {
diff --git a/cmd/gitmirror/gitmirror.go b/cmd/gitmirror/gitmirror.go
index b41299d..d0c72e2 100644
--- a/cmd/gitmirror/gitmirror.go
+++ b/cmd/gitmirror/gitmirror.go
@@ -304,7 +304,8 @@
 		"tools",
 		"tour",
 		"vgo",
-		"website":
+		"website",
+		"xerrors":
 		return true
 	}
 	// Else, see if it appears to be a subrepo:
diff --git a/maintner/maintnerd/maintnerd.go b/maintner/maintnerd/maintnerd.go
index 0346dd4..0ed8e2f 100644
--- a/maintner/maintnerd/maintnerd.go
+++ b/maintner/maintnerd/maintnerd.go
@@ -336,6 +336,7 @@
 	"golang/tour",
 	"golang/vgo",
 	"golang/website",
+	"golang/xerrors",
 }
 
 func setGoConfig() {