crypto: honor default ciphers in client mode

Right now no default ciphers are use in, e.g. https.get, meaning that
weak export ciphers like TLS_RSA_EXPORT_WITH_DES40_CBC_SHA are
accepted.

To reproduce:

node -e "require('https').get({hostname: 'www.howsmyssl.com', \
  path: '/a/check'}, function(res) {res.on('data', \
  function(d) {process.stdout.write(d)})})"
node: register modules from DSO constructors

Built-in modules should be automatically registered, replacing the
static module list.  Add-on modules should also be automatically
registered via DSO constructors.  This improves flexibility in adding
built-in modules and is also a prerequisite to pure-C addon modules.
test: fix test-net-listen-fd0 for pipes

In the case of a pipe'd input, i.e. from the CI the fd will be a PIPE
and when listen() is called it will return ENOTSOCK instead of EINVAL.
test: make abort-fatal-error more robust

It's saner to check exit codes or signals to determine if the process
actually aborted. On OSX and Linux the exit code is 134, on SunOS it
propagates the SIGABRT signal
test: use logical and not or in abort-fatal-error
Merge remote-tracking branch 'upstream/master'