ssl.{SSLSession,MemoryBIO} (RustPython#6209)

* SSLSession

* get_unverified_chain

* SSL MemoryBIO

Author: youknowone

Lib/ssl.py

@@ -98,7 +98,7 @@
 import _ssl             # if we can't import it, let the error propagate
 
 from _ssl import OPENSSL_VERSION_NUMBER, OPENSSL_VERSION_INFO, OPENSSL_VERSION
-from _ssl import _SSLContext#, MemoryBIO, SSLSession
+from _ssl import _SSLContext, SSLSession, MemoryBIO
 from _ssl import (
     SSLError, SSLZeroReturnError, SSLWantReadError, SSLWantWriteError,
     SSLSyscallError, SSLEOFError, SSLCertVerificationError
@@ -114,7 +114,7 @@
 
 from _ssl import (
     HAS_SNI, HAS_ECDH, HAS_NPN, HAS_ALPN, HAS_SSLv2, HAS_SSLv3, HAS_TLSv1,
-    HAS_TLSv1_1, HAS_TLSv1_2, HAS_TLSv1_3
+    HAS_TLSv1_1, HAS_TLSv1_2, HAS_TLSv1_3, HAS_PSK
 )
 from _ssl import _DEFAULT_CIPHERS, _OPENSSL_API_VERSION