Adjust FreeBSD version check to follow FreeBSD Porter's Handbook

http://www.freebsd.org/doc/en/books/porters-handbook/porting-versions.html

global variables reordering/refactoring/commenting

  headers work correctly even on FreeBSD systems before v8.

end-of-body treatment

doesn't really return any body data to check so I made SMTP check "headers"
as well.

order to re-use 'classic' stopping and allow taking test-suite run time
references from this state.

  did not include a definition for HAVE_CLOSESOCKET which resulted in
  function close() being inappropriately used to close sockets.

of output, even when run time statistics are shown.

server logs advisor read lock and before test results verifications are done.

When stopping a pingpong server, stop server before its slaves.

now adding 90 extra seconds to the total time some autobuilds
need to make a full test-run.

Improve delay command interruptability

a wide variety of protocol servers

- Attempt to fix script compilation failure on versions older than 5.007003,
  corelist -a Time::HiRes lists this as the first version released with it.

- Ensure ftp check delay timer is always an integral number.

in cases like test 190

Slack time reduction

Added runtests.pl '-r' option for run time statistics

data is required in order to closer match total test execution time.