Windows: register idle dead timeout error

Windows: register idle dead timeout error

be like the unix cache manager and set an error code
so idle dead time is enforced on sending.

LICENSE MIT

Reviewed-on: http://gerrit.openafs.org/3033
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
(cherry picked from commit f943a4eb524434d25ecf99cba0843ded13aef176)
Change-Id: I8ede65aef843af358455126301067d0b889ae9a8
Reviewed-on: http://gerrit.openafs.org/3143
Tested-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>