Update golang to 1.17

[szh]

Use the latest major version of Go. Also fix ssh tests by replacing RSA test cert with ECDSA

Connected Issue/Story

CyberArk internal issue link: ONYX-14555

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[doodlesbykumbi]

@szh I think we still need to add HostKeyAlgorithms=ssh-rsa to the ssh test service command. Without it we will have occasional failures like this:

/ # ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -p 2222 secretless ls -la
Unable to negotiate with 172.28.0.4 port 2222: no matching host key type found. Their offer: ssh-rsa

I'm not sure why these are occasional and not all the time. But when we add the HostKeyAlgorithms option it works every time. I know that the occasional failures are resolved by this because the Secretless SSH server uses an ssh-rsa key (and so the client needs to enable that).

[codeclimate]

Code Climate has analyzed commit bb81fac and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 54.8% (0.0% change).

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[doodlesbykumbi]

LGTM! Thanks for doing this