fix cloning of mercurial repository with username and password specified in url

Signed-off-by: Volker Vogelhuber <v.vogelhuber@digitalendoscopy.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
parse/ast: Show append logging at lower log level

It was reported that bitbake -D made no mention of which append files it
was using. bitbake -DD does but it makes sense to increase the log level
of this piece of debug information.

[YOCTO #6262]

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>