Release 2.17.0

- [FEATURE] QUIC and HTTP/3 Internet Draft 29 support.
- [BUGFIX] Check that scheduled packets are also sendable when
  calculating a connection's "tickable" property.
- [BUGFIX] Don't count scheduled packets as in-flight when pacer is
  checked on tick.
- gQUIC: delay calling on_new for pushed stream until headers are
  available.
- Allow nested calls to lsquic_engine_connect().

tests/test_clear_aead.c

@@ -33,7 +33,7 @@ main (void)
     };
 
     HKDF_extract(secret, &secret_len, md, dcid.idbuf, dcid.len,
-                                                HSK_SALT, HSK_SALT_SZ);
+                                                HSK_SALT_PRE29, HSK_SALT_SZ);
 
     assert(sizeof(expected_secret) == secret_len);
     assert(0 == memcmp(secret, expected_secret, sizeof(expected_secret)));