sslutil: print SHA-256 fingerprint by default The world is starting to move on from SHA-1. A few commits ago, we gained the ability to define certificate fingerprints using SHA-256 and SHA-512. Let's start printing the SHA-256 fingerprint instead of the SHA-1 fingerprint to encourage people to pin with a more secure hashing algorithm. There is still a bit of work to be done around the fingerprint messaging. This will be addressed in subsequent commits.

sslutil: move and change warning when cert verification is disabled A short time ago, validatesocket() didn't know the reasons why cert verification was disabled. Multiple code paths could lead to cert verification being disabled. e.g. --insecure and lack of loaded CAs. With the recent refactorings to sslutil.py, we now know the reasons behind security settings. This means we can recognize when the user requested security be disabled (as opposed to being unable to provide certificate verification due to lack of CAs). This patch moves the check for certificate verification being disabled and changes the wording to distinguish it from other states. The warning message is purposefully more dangerous sounding in order to help discourage people from disabling security outright. We may want to add a URL or hint to this message. I'm going to wait until additional changes to security defaults before committing to something.