Xenial SRU - Read MOKSBState from the MOK

[tim.gardner at canonical.com]

This patch set reads MOKSBState from the MOK which is used to override
secure boot when a user wishes to deploy third party modules such as DKMS.

Patch 3 is not strictly required, but does provide a little extra information
as to _why_ secure boot mode is disabled in the kernel.

A more verbose explanation is provided in http://bugs.launchpad.net/bugs/1571691

rtg

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