Add bbappend for 3.10 kernel.
Add sysvinit to DISTRO_FEATURES in oe-selinux distro.

The oe-selinux distro won't build against the master branch of
oe-core unless sysvinit is in DISTRO_FEATURES.
Commit c72ec4b52827f75351790eab483d258b2e87611a in oe-core adds a
sanity check to the packagegroup class that requires the
VIRTUAL-RUNTIME_init_manager explicitly be set in DISTRO_FEATURES.