[yocto] [OE-core] Autobuilder changes

[Richard Purdie]

On Fri, 2018-11-23 at 17:02 +0000, Richard Purdie wrote:
> I've take this quiet period as an opportunity to make some
> significant autobuilder changes:

I knew I was missing something:

Successful builds are now deleted when they complete using the
background deletion (clobberdir). This should reduce the clutter lying
around on the worker filesystems. It also means builds shouldn't be
contending with background deletion as much.

Failed builds have their build directory renamed to "build-renamed".
This means that the paths all become invalid and can't be accidentally
referenced from other builds.

I did a sweep through the workers deleting all the old build
directories and cleared a lot of the diskspace on them.

Cheers,

Richard