ssl_encryption_test.rb (integration test) failures with C* 4.0,

Description

Noticed on more recent CI runs:

```
Finished tests in 22.817172s, 0.1753 tests/s, 0.1753 assertions/s.

1) Failure:
SSLEncryptionTest#test_raise_error_when_not_using_ssl /work/git/ruby-driver/integration/security/ssl_encryption_test.rb:39:
Cassandra::Errors::NoHostsAvailable expected but nothing was raised.

4 tests, 4 assertions, 1 failures, 0 errors, 0 skips
```

Unable to reproduce locally with 4.0-alpha3, however this started appearing around the time Jenkins switched over to... 4.0-beta1.

Can reproduce locally with 4.0-beta2.

Environment

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Reporter

Bret McGuire

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