build: sort list of built/failed images before printing
build: sort list of built/failed images before printing

I am building all images as test for my non-x86 support patch. Several
images fail for misc reasons. I am tired of having to copy/paste 'kolla'
output for manual sorting to find out which built, which failed.

Change-Id: I2ed9c7353040106650cbffb04eca8877fb7fc187

stackforge/kolla,intel-onp/kolla,stackforge/kolla,mrangana/kolla,mrangana/kolla,openstack/kolla,GalenMa/kolla,openstack/kolla,coolsvap/kolla,coolsvap/kolla,GalenMa/kolla,coolsvap/kolla,nihilifer/kolla,rahulunair/kolla,stackforge/kolla,nihilifer/kolla,intel-onp/kolla,rahulunair/kolla