Fix publickey authentication with signed RSA key (#1963) #1977
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When paramiko client uses signed RSA key for publickey authentication, the session blob is generated with
rsa-sha2-{256,512}andssh-rsarather than*-cert-v01@openssh.cominauth_handler.py. As the result, the publickey authentication is failed.rsa-sha2-{256,512}-cert-v01@openssh.comandssh-rsa-cert-v01@openssh.comshould be used for the session blob when signed RSA key is used.