This commit updates the download version for OpenSSL in appveyor,
previous to this commit the version that was installed was mismatched
from the download version.
This abolishes the test.sh script which spawns a bunch of `openssl` instances to
instead run/manage the binary in-process (providing more isolation to boot). The
tests have been updated accordingly and the `connected_socket` dependency was
also dropped in favor of `net2` as it the former doesn't work on Windows.
Matt Ball