[Toaster] RFC: fixes for 8443 (better display for failed builds)

[Smith, Elliot]

I've got a branch where I've implemented a fix for
https://bugzilla.yoctoproject.org/show_bug.cgi?id=8443

The branch is on poky-contrib:
elliot/toaster/failed_builds_display-8443-rebased-on-failed_builds-8440-v5

To test, start some failing builds:

1. Bad target, e.g. zzzz
2. Bad MACHINE
3. Bad DISTRO

These builds should have a dashboard without the left-hand nav panel;
builds which fail later should show the full dashboard.

As a quick solution (while we consider whether to rework Build and
BuildRequest and their lifecycles), I've added a property to Build which
counts the number of variables it has associated with it. This is because
we don't record the variables against a Build until the BuildStarted event
occurs, so we can tell whether BuildStarted has been received by querying a
Build's associated variables.

As you can see from the branch name, this needs the patches for 8440 to
work correctly (where I split Build object creation into two pieces, before
and after BuildStarted). So I rebased it on
elliot/submit/failed_builds-8440-v5.

The elliot/submit/failed_builds-8440-v5 branch is awaiting review:
https://lists.yoctoproject.org/pipermail/toaster/2016-February/003837.html

Once elliot/submit/failed_builds-8440-v5 is in toaster-next, I'll rebase
again and formally submit
elliot/toaster/failed_builds_display-8443-rebased-on-failed_builds-8440-v5.

Thanks.
Elliot
-- 
Elliot Smith
Software Engineer
Intel Open Source Technology Centre
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