Message 392451 - Python tracker

According to msg391924, more types should use Py_TPFLAGS_DISALLOW_INSTANTIATION:

* _md5.md5
* _sha1.sha1
* _sha256.sha224
* _sha256.sha256
* _sha512.sha384
* _sha512.sha512

* select.devpoll: I created PR 25751
* select.kevent: it implements a working tp_new method: "{Py_tp_new, select_kqueue},"

* sqlite3.Cache
* sqlite3.Connection
* sqlite3.Cursor
* sqlite3.Node
* sqlite3.Row
* sqlite3.Statement