beagle-xm: add prompt string for upstream u-boot

Change-Id: Ie48a1360092b2370bae94e68c0a78a23917b1e61
Downloader: Support http://user:pass@host urls

From 442463f556979fedcfabc522d543fdc39e4d3f0e Mon Sep 17 00:00:00 2001
From: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Date: Tue, 23 Sep 2014 11:02:35 +0200
filename=0001-Downloader-Support-http-user-pass-host-urls.patch
DebianBug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=762572

For private images it can be useful to specify the download urls with a
username and password. Unfortunately urllib2 doesn't support those
directly so some manual work is required to get those going.

Update patch for PEP8 compliance.

Change-Id: I4e60aa74c87196acba801ab21a156a182dfea5ff