- Add proc locking. - Fix several bugs in the wait syscall, including freeing the actual   proc start, freeing the args, freeing the prison, and other minor   nits. - Use appropriate queue(3) macros. - Use zpfind() instead of walking zombproc ourselves.
- Add proc locking.
- Fix several bugs in the wait syscall, including freeing the actual
  proc start, freeing the args, freeing the prison, and other minor
  nits.
- Use appropriate queue(3) macros.
- Use zpfind() instead of walking zombproc ourselves.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase