Re: [libvirt] [PATCH v3 0/6] Facilitate running libvirt builds via docker containers

For a while QEMU has provided simple make rules for building QEMU inside standard docker container environments. This provides an equivalent mechanism for libvirt inspired by QEMU's. QEMU actually builds the container images on developer's machines locally. Libvirt already hosts pre-built images on quay.io, so that is used directly as it is quicker to download them than to build them locally. This also ensures the container contents match what the live CI system is using, as opposed to building an image with newer packages. NB, there is a currently a test failure with this change to travis that we don't currently see. Current travis runs a privileged docker container, but with this change we now run unprivileged containers. This shows that the "virsh-snapshot" test is trying to create a file under $HOME, and docker blocks this. Obviously needs fixing before pushing.