Make sure all kernels support containers

Created by: zhuowei

I noticed that some devices do not explicitly enable CONFIG_NAMESPACES, which is one of the options required for Linux containers. (I believe that option does default to true on kernels, but not sure about others.)

There's quite a few projects using containers (Anbox, Docker, etc), so we should investigate which kernel options are required for them, and then check/enable them on all the supported kernels.