MFC r318325:

MFC r318325:

Start writing up some basic feature tests for procstat

These tests query a running process for information related to the -b,
-c, -e, and -f flags; the -f testcase is largely stubbed out, pending
additional work to determine a good, deterministic descriptor.

Core file test support is coming soon--it requires a bit more effort
due to the fact that:
- coredumps can be disabled (kern.coredump=0).
- corefiles can be put in different directories than the current
  directory, or be named something other than `<prog>.core`
  (`kern.corefile`).

git-svn-id: svn://svn.freebsd.org/base/stable/10@321084 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f