UBUNTU: SAUCE: UEFI: Add secure boot and MOK SB State disabled sysctl

UBUNTU: SAUCE: UEFI: Add secure boot and MOK SB State disabled sysctl

BugLink: http://bugs.launchpad.net/bugs/1593075
This is a better method for detecting the state of secure boot and
the MOKSBState override, as opposed to grepping status from the kernel log.
Both variables return 0 or 1. If secure_boot==0 then signed module
enforcement is not enabled. Likewise, if moksbstate_disabled==1 then
signed module enforcement is not enabled. The only conditions uder which
signed module enforcement is enabled is when secure_boot==1 and
moksbstate_disabled==0.

/proc/sys/kernel/secure_boot
/proc/sys/kernel/moksbstate_disabled

Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>