TransRead: support URLs with user name and password

TransRead: support URLs with user name and password

Markus Lehtonen reported that bmaptool does not support URLs which contain user
name and password, e.g., https://marquiz:qwerty@server.com/nice.image.bz2.

This patch adds the corresponding support. What we do is we first parse the URL
and try to figure out if it contains user name and password, and if it does,
open the URL with a specially build opener which supports authentication.

Change-Id: I517eb9ffd21ff5de6e9deac4c0cacffe82e53ad5
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@intel.com>