Revert "Read driver controls from registry. This enables us to run with COM logging in production so we can get more information on a bug where vioscsi builds all three queues on the same GPA."

My reason for reverting this commit:
COM logging is an absolutely special kind of logging. It suppose to work for debug builds, not for production.
It suppose to be activated when we hit some sort of OS installation problems (when Registry keys are not yet available)
or any other cases when live or postmortal debugging is just impossible for some reasons.

This reverts commit 6504c29440a83e5fb9f7d06f5c90e4dcd850b264.

Conflicts:
	vioscsi/utils.h
Revert "Fix bug resulting in vioscsi building all 3 queues on the same queue GPA when Windows re-initializes the adapter."

This reverts commit bd0d8f43716578b5ef9e48ed3fe82f7ce8a8997a.

My reason for reverting this patch:
Several bugs in dump and hibernation stacks

Conflicts:
	vioscsi/vioscsi.c
confirm guest features before init virtqueues.
based on 23de1376b695c28432fbbc55584644188c4e51ef
commit 23de1376b695c28432fbbc55584644188c4e51ef
Author: Julius Rus <iuliur@google.com>
Date:   Sun Oct 19 16:12:16 2014 -0700

    Only enable hotplug if the host advertises it.

    Signed-off-by: Iuliu Rus <iuliur@google.com>
Cosmetic change: untabify vioscsi.h.

Signed-off-by: Iuliu Rus <iuliur@google.com>