Adding tests for OpenPGP.

All tests are taken from gnuk. Reader is migrated from pyusb to pyscard.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>

tests/skip_if_no_kdf_support.py

@@ -0,0 +1,6 @@
+import pytest
+
+@pytest.fixture(scope="module",autouse=True)
+def check_kdf_support(card):
+    if not card.kdf_supported:
+        pytest.skip("No KDF support", allow_module_level=True)