- 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

Instead of allocating memory for all the keys at device attach,
create reasonably large cache for the keys that is filled when
needed. The previous version was problematic for very large providers
(hundreds of terabytes or serval petabytes). Every terabyte of data
needs around 256kB for keys. Make the default cache limit big enough
to fit all the keys needed for 4TB providers, which will eat at most
1MB of memory.

MFC after: 2 weeks

Remove WARNS from here and compile with default kernel flags.

Connect new GELI files to the build.

Supported by: Wheel Sp. z o.o. (http://www.wheel.pl)

Dike out WARNS from kernel module makefiles. Kernels and modules
use a different mechanism for setting warning flags, and using
WARNS here only has null or negative effects.

Submitted by: bde (I think it means "submitted")

Check rootvnode variable to see if we still want to ask for passphrase on
boot. Other methods just don't work properly.

MFC after: 3 days

Add GEOM_ELI class which provides GEOM providers encryption.
For features list and usage see manual page: geli(8).

Sponsored by: Wheel Sp. z o.o.
http://www.wheel.pl
MFC after: 1 week