zshrc: add and update more ssh / SSHFP functions
zshrc: add and update more ssh / SSHFP functions

- update get-ssh-pubkeys-host to not generate SSHFP RR
- add get-sshfp-from-public-key
- add get-sshfp-from-public-key-file
- add get-sshfp-from-public-key-directory
- add get-ssh-keys-from-remote

compilenix/dotfiles,compilenix/dotfiles