[master] Fix shell.KEY_VALID_RE to match host authenticity message. Fixes #62782

[bendikro]

The shell.KEY_VALID_RE regex only matches messages containing '(yes/no)', and not messages containing '(yes/no/[fingerprint])' This leads to the salt-ssh command hanging, (Shell._run_cmd waits for data on stdout) while the ssh command is waiting on input.

Fix by updating the KEY_VALID_RE regex to match both prompts

What does this PR do?

Fixes a bug where salt-ssh hangs (waiting for more output), while ssh is waiting on input from user.

What issues does this PR fix or reference?

Fixes #62782

Previous Behavior

When output containing (yes/no) is found, salt-ssh exits and prints the output from ssh about host authenticity

New Behavior

When output containing (yes/no) or (yes/no/[fingerprint]) is found, salt-ssh exits and prints the output from ssh about host authenticity

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• Docs
• Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
• Tests written/updated

Commits signed with GPG?

No

Please review Salt's Contributing Guide for best practices.

See GitHub's page on GPG signing for more information about signing commits with GPG.

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