sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

Hyper-V: hn: add switch to turn on and off RSC

Currently RSC offloading is enabled by default.
With this new change rsc will be disabled by default.
By using sysctl we can enable and disable it.

Reviewed by: whu
Signed-off-by: Souradeep Chakrabarti <schakrabarti@microsoft.com>
Fixes: a491581f3f8df Enable vSwitch RSC support in hn netvsc driver
MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D34507

hyperv/hn: Fix MTU setting

- Add size of an ethernet header to the value configured to NVS. This
does not seem to have any effects if MTU is 1500, but fix hypervisor
side's setting if MTU > 1500.
- Override the MTU setting according to the view from the hypervisor
side.

MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D12352

hyperv: Update copyright for the files changed in 2017

MFC after: 3 days
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D11982

hyperv/hn: Fixat RNDIS rxfilter after the successful RNDIS init.

Under certain conditions on certain versions of Hyper-V, the RNDIS
rxfilter is _not_ zero on the hypervisor side after the successful
RNDIS initialization, which breaks the assumption of any following
code (well, it breaks the RNDIS API contract actually). Clear the
RNDIS rxfilter explicitly, drain packets sneaking through, and drain
the interrupt taskqueues scheduled due to the stealth packets.

Reported by: dexuan@
MFC after: 3 days
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D10230

hyeprv/hn: Rename cleaned up RNDIS header file.

MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8360