sockets: Drop sockets_debug debug code

sockets: Drop sockets_debug debug code

I'm trying to improve this code's error reporting, and the debug code
is getting in my way: it clutters the code, it clobbers errno in
inconvenient places, and it uses the same fprintf() both for error
reporting and debug output in a few places.

Get rid of it.  Once decent error reporting is in place, adding back
whatever debug code we need shouldn't be hard.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>