Copy stable/11@r303970 to releng/11.0 as part of the 11.0-RELEASE
cycle.

Prune svn:mergeinfo from the new branch, and rename it to RC1.

Update __FreeBSD_version.

Use the quarterly branch for the default FreeBSD.conf pkg(8) repo and
the dvd1.iso packages population.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Check the hw.proto.attach environment variable for devices that
proto(4) should attach to instead of the normal driver.

Document the variable.

Add create, destroy and load of memory descriptors.

Add an ISA/ACPI bus attachment to proto(4).

Implement mmap(2) for the busdma resource.

Add DMA memory allocation and freeing.
Slightly rework the tag handling.

DMA support part 1: DMA tag create & destroy

Create a special resource (= device special file) for management
of tags and maps, as well as for mapping memory into the address
space. DMA resources are managed using the PROTO_IOC_BUSDMA ioctl.
Part 1 implements tag creation, derivation and destruction.

Add proto(4): A driver for prototyping and diagnostics.
It exposes I/O resources to user space, so that programs can peek
and poke at the hardware. It does not itself have knowledge about
the hardware device it attaches to.

Sponsored by: Juniper Networks, Inc.