Allow unicode in identity string for SSH and GPG

libagent/tests/test_interface.py

@@ -0,0 +1,7 @@
+from ..device import interface
+
+
+def test_unicode():
+    i = interface.Identity(u'ko\u017eu\u0161\u010dek@host', 'ed25519')
+    assert i.to_bytes() == b'kozuscek@host'
+    assert sorted(i.items()) == [('host', 'host'), ('user', 'kozuscek')]