Windows: Test AFS_DBG_FLAG_BREAK_ON_ENTRY earlier

During AFSRedir.sys initialization, check the AFS_DBG_FLAG_BREAK_ON_ENTRY
registry flag before initializing the trace log system.

Change-Id: I928fab78b40dce51d2c0686bce68eb76f941b214
Reviewed-on: http://gerrit.openafs.org/9622
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>