create_socket: Use urllib because urllib2 is now urllib in python3
and proxies as argument are deprecated so export them in the environ
instead.
get_links_from_url: Change usage of sgmllib for parsing HTML because
is deprecated in python 3, use instead bs4 that is already imported
in the bitbake tree.
[YOCTO #9744]
Signed-off-by: Aníbal Limón <anibal.limon@linux.intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
