syscall_emul: [patch 5/22] remove LiveProcess class and use Process instead

The EIOProcess class was removed recently and it was the only other class
which derived from Process. Since every Process invocation is also a
LiveProcess invocation, it makes sense to simplify the organization by
combining the fields from LiveProcess into Process.

tests: Final reclassification of quick regressions

A few regressions were still considered long, but finished well within
the 180 seconds. They are only a handful (mostly mcf in atomic).