Revert root check (#412)

Signed-off-by: Riley Laine <rlaine@slack-corp.com>
Signed-off-by: Esme Lamb <dlamb@slack-corp.com>

go/vt/servenv/servenv.go

@@ -133,9 +133,9 @@ func Init() {
 
 	// Once you run as root, you pretty much destroy the chances of a
 	// non-privileged user starting the program correctly.
-	// if uid := os.Getuid(); uid == 0 {
-	// 	log.Exitf("servenv.Init: running this as root makes no sense")
-	// }
+	if uid := os.Getuid(); uid == 0 {
+		log.Exitf("servenv.Init: running this as root makes no sense")
+	}
 
 	// We used to set this limit directly, but you pretty much have to
 	// use a root account to allow increasing a limit reliably. Dropping