Better error handling at startup and fixed some bugs

Fixed bug where manually specifying port 443 disabled TLS (whoops); otherHostHasScheme was the culprit, since it would return true even if it was the same config that had that scheme.

Also, an error at startup (if not a restart) is now fatal, rather than keeping a half-alive zombie server.

main.go

@@ -79,7 +79,11 @@ func main() {
 	// Start your engines
 	err = caddy.Start(caddyfile)
 	if err != nil {
-		log.Fatal(err)
+		if caddy.IsRestart() {
+			log.Println("error starting servers:", err)
+		} else {
+			log.Fatal(err)
+		}
 	}
 
 	// Twiddle your thumbs