Missing Step: Edit "RSA" to key file

[mprt]

The first line of the RSA keyfile has to be
-----BEGIN RSA PRIVATE KEY-----

However, the "RSA" part is missing when executing the suggested command to generate a test private key.
I had to manually modify the line. Otherwise I would raise an exception every time:
paramiko.ssh_exception.SSHException: not a valid RSA private key file

[mrigor]

+1, had to:
sed -i 's/BEGIN PRIVATE/BEGIN RSA PRIVATE/' /tmp/test_rsa.key

[PaulKierstead]

I had to actually convert the key using
ssh-keygen -p -m PEM -f /temp/test_rsa.key
to get the key in the right format. Just changing the header wasn't enough.