- Copy stable/10@296371 to releng/10.3 in preparation for 10.3-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.3.
- Update default pkg(8) configuration to use the quarterly branch.

Approved by: re (implicit)

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

Consistently set us to be SPC3 for our inquiry data.

For mptest, add delays to I/O that simulate real disks better. This
also allows us to simulate what happens when a device goes away
with active transactions. It's pretty spectacular.

Sponsored by: Panasas
MFC after: 1 month

Add the VHBA package. It is here in tools because it's really a testbed.

Sponsored by: Panasas
MFC after: 1 month