Merge pull request #150 from jld/bug969088-b2g-ps-seccomp

Bug 969088 - Include per-process/thread seccomp state in b2g-ps output.
Bug 969090 - Make b2g-ps read process/thread name from /proc/<pid>/status.

This is helpful on the ICS emulator, which uses an old kernel version
where /proc/<pid>/comm doesn't exist.