Fix issues with appended boot signature.

In particular this changes the OID to the SHA1 OID and
appends the full BootSignature.

This is cherry-picked from a WIP bug checked into master, but is complete.
The work in finalized by further changes from Sami Tolvanen

Bug: 15984840
Change-Id: Ic43784fc339b9aedf91363c9ec9a453c3bb53294
(cherry picked from commit 1f2ebbd57e86fb0749aeb453fb337065985ab9c6)
1 file changed