- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

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

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

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

Purge mergeinfo in sys/ that is either empty or a subset of the parent
mergeinfo on sys/ itself.

Approved by: re (mergeinfo blanket)

Integrate user/mav/ata branch:

Add ch_suspend/ch_resume methods for PCI controllers and implement them
for AHCI. Refactor AHCI channel initialization according to it.

Fix Port Multipliers operation. It is far from perfect yet, but works now.
Tested with JMicron JMB363 AHCI + SiI 3726 PMP pair.
Previous version was also tested with SiI 4726 PMP.

Hardware sponsored by: Vitsch Electronics / VEHosting.nl

Add in forgotten module ipmi_linux.

Found by: mlaier