Now that there's a serialized instance object on the BuildRequest object
and in the build_requests table a lot of fields/columns are no longer
necessary. To prepare for removal of the columns from the db at a later
time references to them have been removed. This starts a deprecation
timer so that they can be removed in Ocata at the earliest.
Note that the BuildRequest object was never passed over the wire, and is
just created and immediately destroyed at this point so there is no need
to handle backwards compatibility for these changes.
Change-Id: Ie86ba66d5f73c153b68bef83661d4c8bdb0ae9dc
98a05bc637