Add support for other keytypes to openssh-key-v1 keyfiles (#485)

* Added support for RSA to openssh-key-v1 keyfile

* Fixed exception

* Added ECDSA support to openssh-key-v1

* Added integration tests for different keytypes

src/test/resources/keyformats/rsa_opensshv1

@@ -0,0 +1,49 @@
+-----BEGIN OPENSSH PRIVATE KEY-----
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+-----END OPENSSH PRIVATE KEY-----