several issues in auto-build.sh when building containerd images

[27149chen]

What happened:

Threr are several issues in auto-build.sh script when building containerd images:

1. function utils_get_distribution is not found in context/containerd/rootfs/scripts/containerd.sh
2. params --buildName does not work at all
3. docker and containerd tarballs are all named: docker.tar.gz
4. no /etc/containerd.service and tgz/containerd.tgz in rootfs for containerd images

[27149chen]

another related issue #42