Revert "Add test for bare PING-PONG protocol over TLS handle (#55)" (#63)

This reverts commit 9d86cdb.

These tests aren't working because the certificate they use is expired.

It either needs to be longer-lived or generated automatically as part of
the test suite to ensure it isn't expired.

Author: tarcieri

Cargo.lock

@@ -43,7 +43,3 @@ std = ["alloc", "webpki/std", "pki-types/std", "rustls/std", "ed25519-dalek/std"
 # TODO: go through all of these to ensure to_vec etc. impls are exposed
 alloc = ["webpki/alloc", "pki-types/alloc", "aead/alloc", "ed25519-dalek/alloc"]
 zeroize = ["ed25519-dalek/zeroize", "x25519-dalek/zeroize"]
-
-[dev-dependencies]
-openssl = { version = "0.10", default-features = false }
-pem-rfc7468 = { version = "0.7", default-features = false, features = ["alloc"] }