Move branchless tempest to implemented specs

The branchless tempest specification has been marked as completed
in LP. This is the first BP that has been implemented since we
started using specs. So the initial setup for handling implemented
specs for archive is done in this commit as well.

Change-Id: I8ea6888a1c7ee4d5569740bab3a496690c3d40f3
Merge "Move branchless tempest to implemented specs"