[poky] Autobuilder performance

[Richard Purdie]

Just as a quick note on performance of builds, the autobuilder managed
to build:

qemux86:       image-minimal, image-sato, image-sato-sdk, image-lsb
               meta-toolchain-sdk (32) meta-toolchain-sdk (64)
qemux86-64:    image-minimal, image-sato, image-sato-sdk, image-lsb
               meta-toolchain-sdk (32) meta-toolchain-sdk (64)
emenlow:       image-minimal-live, image-sato-live, image-sato-sdk-live
atom-pc:       image-minimal-live, image-sato-live, image-sato-sdk-live

in 9 hours.

Given this is 3 complete full builds (emenlow and atom-pc share
optimisation flags) and it includes two flavours of toolchain (1.5
hours) and sanity testing (15 mins), the timescales aren't too bad.

They could always be better of course but we did seem to be doing a lot
worse than this.

Cheers,

Richard