agent: SSH support improvement.
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Description

agent: SSH support improvement.

* agent/command-ssh.c (ssh_handler_request_identities): Skip a key with
error, not giving up to handle the request itself.
* agent/cvt-openpgp.c (extract_private_key): Support "ecdsa" key.

Note that "ecdsa" key is still in use by old versions of gpg-agent
through its SSH handling (until 2.1.14). With old versions of
gpg-agent, adding ECDSA key by ssh-add command, "ecdsa" key will be
created. So, "ecdsa" key should be supported.

For g10/gpg, "ecdsa" and "ecdh" was only used in some experimental
versions of libgcrypt, with parameters. We now use "ecc" for all cases
in released versions.