Windows: afslogon network provider debug registry value

Windows: afslogon network provider debug registry value

create a new TransarcAFSDaemon\NetworkProvider "Debug" value
to be used for activating the network provider debugging.
The overlapping use of TransarcAFSDaemon\Parameters "TraceOption"
is just too confusing.

Permit both methods to be used.

Change-Id: I4ba233b38bda547af35aa4b363edc819bcc3792c
Reviewed-on: http://gerrit.openafs.org/5316
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>