go/statusz: do not crash on failure to resolve uid

This can happen if a binary is built statically and fails to load
libgcc/nsd libraries at runtime.

Change-Id: Ia76645471b83a6cc75fe6552e70e6a251b50129c

go/statusz/statusz.go

@@ -38,6 +38,7 @@ import (
 	"html"
 	"html/template"
 	"io"
+	"log"
 	"net/http"
 	"os"
 	"os/user"
@@ -197,9 +198,11 @@ func init() {
 
 	user, err := user.Current()
 	if err != nil {
-		glog.Fatalf("user.Current: %v", err)
+		log.Printf("user.Current: %v", err)
+		username = "UNKNOWN"
+	} else {
+		username = fmt.Sprintf("%s (%s)", user.Username, user.Uid)
 	}
-	username = fmt.Sprintf("%s (%s)", user.Username, user.Uid)
 
 	exec, err := os.Executable()
 	if err == nil {