remove SSL tests

This feature is on hold for now, since it never really took
off and kgio-monkey is more-or-less abandoned.  I'm not looking
forward to supporting OpenSSL unless there's interest.

This was mainly intended as an experiment to deal with a bad
hardware/firmware situation on a LAN I have.  It allowed SSL
to abort on corrupt packets.
script/isolate_for_tests: bump to latest versions

kgio and raindrops were both updated for Ruby 2.2.0dev r44955
and later, so depend on them in our tests.