runtime-v2: add validation for runtime name
runtime-v2: add validation for runtime name

add validation for runtime name, if runtime name is invalid,
containerd will got panic.

Signed-off-by: Ace-Tang <a967bc6ab01ace27203ca6ab9fd77fbd3b598184@126.com>

miaoyq/containerd,vdemeester/containerd,dmcgowan/containerd,estesp/containerd,miaoyq/containerd,vdemeester/containerd,estesp/containerd,containerd/containerd,mikebrow/containerd,thaJeztah/containerd,thaJeztah/containerd,containerd/containerd,crosbymichael/containerd,mikebrow/containerd,crosbymichael/containerd,dmcgowan/containerd