hyperv/hn: Remove the redundant rid setting for RNDIS HALT.

Sponsored by:   Microsoft
Differential Revision:  https://reviews.freebsd.org/D7595

hyperv/hn: Log a warning for RESET_CMPLT.

RESET is not used by the hn(4) at all, and RESET_CMPLT does not even
have a rid to match with the pending requests.  So, let's put it
onto an independent switch branch and log a warning about it.

Sponsored by:   Microsoft
Differential Revision:  https://reviews.freebsd.org/D7602