Allow crypto_method context value in stream_socket_enable_crypto()
Bug #67224: stream_socket_enable_crypto()

- Allow crypto_method context value in stream_socket_enable_crypto()
- As of 5.6.x stream crypto type may be specified in the SSL context,
  making the $crypto_type parameter to stream_socket_enable_crypto()
  optional. This commit checks for a crypto type in the context prior
  to erroring out.
- Update NEWS/UPGRADING
Merge branch 'PHP-5.6'

* PHP-5.6:
  Allow crypto_method context value in stream_socket_enable_crypto()