Fix sslyze crash on some domains in nassl handshake

[moubarakelmahdi1]

This pull request fixes two blocking errors in nassl that occur when running sslyze on certain domain names.
When the "last octet invalid" and "bad signature" errors occur together, or when the "first octet invalid" and "bad signature" errors occur together, the thread stops and the SoftTimeLimitExceeded error is thrown on our threads.

Exception in thread Thread-3:
Traceback (most recent call last):
...
File "/home/***/.venv/***/lib/python3.10/site-packages/nassl/ssl_client.py", line 194, in do_handshake
    self._ssl.do_handshake()
nassl._nassl.OpenSSLError: error:0407E086:rsa routines:RSA_verify_PKCS1_PSS_mgf1:last octet invalid
error:1417B07B:SSL routines:tls_process_cert_verify:bad signature

I have forked the project and made the necessary change to fix these errors.

These changes should prevent the blocking errors from occurring and allow sslyze to run successfully on certain domain names. I have tested these changes locally and they appear to be working as expected.

[moubarakelmahdi1]

"https://vpn.neoen.com/"
"https://vpn.routin1883.com/"
Here are some domains where you can loop and try to reproduce the error

[nabla-c0d3]

Hello,
Thanks for the details and the PR. Unfortunately your changes will not solve the underlying issue, which is that the server is unreliable and will sometimes close the connection early (resulting in this "octet invalid" error).

I don't see a fix for this as the server can't be scanned in a reliable way: sometimes connections will succeed and sometimes they won't.