This implements the following tables on FreeBSD:
process_envs
process_memory_map
process_open_files
process_open_sockets
processes
All the heavy lifting is done with libprocstat(3). All the tables follow
the same general principle. Use the common function, getProcesses() in
procstat.cpp, to get the processes and then generate the rows for each
process returned. There is also a procstatCleanup() function commonly
used across all the tables.
The one thing I am not able to test is the process_open_sockets table on
an IPv6 machine.
