UBUNTU: [Upstream] security: Yama LSM

UBUNTU: [Upstream] security: Yama LSM

This adds the Yama Linux Security Module to collect several security
features (symlink, hardlink, and PTRACE restrictions) that have existed
in various forms over the years and have been carried outside the mainline
kernel by other Linux distributions like Openwall and grsecurity.

Currently accepted in upstream security tree:
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6.git next

Signed-off-by: Kees Cook <kees.cook@canonical.com>
[kees: resolved AppArmor conflicts for Maverick merge]
Signed-off-by: Leann Ogasawara <leann.ogasawara@canonical.com>