luks_device: add built-in signature wiper to work around older wipefs versions with LUKS2 containers (#327) (#330)

* Use 'cryptsetup erase' to kill LUKS signature.

* Adjust unit test.

* Use own wiper for LUKS headers.

* Add comments.

* Fix tests.

* Update changelog.

* Remove 'cryptsetup erase'.

* Improve error messages.

(cherry picked from commit ebbfd7c56f)

Co-authored-by: Felix Fontein <felix@fontein.de>

tests/unit/plugins/modules/test_luks_device.py

@@ -58,6 +58,9 @@ def test_run_luks_remove(monkeypatch):
     monkeypatch.setattr(luks_device.Handler,
                         "_run_command",
                         run_command_check)
+    monkeypatch.setattr(luks_device,
+                        "wipe_luks_headers",
+                        lambda device: True)
     crypt = luks_device.CryptHandler(module)
     crypt.run_luks_remove("dummy")