Manage eyaml data

[tuxmea]

• show encrypted values as is. add a button on the data to show plain text. (decrypt)
• if eyaml is configured: add an encrypt button to save encrypted data. (encrypt)

Prepared testing environment (eyaml).
Provide a config switch, if we want to decrypt values in hdm.conf.

EYaml is configured in hiera.yaml file, by setting the lookup_key to eyaml_lookup and specifying options for private and public key.

If the private key is readable by HDM: provide the option to "decrypt" the data.

Preparation for storing data:

• allow users to encrypt data.

If a user decrypts a value, sets a new one and wants to save it in plain text: provide a warning, and the user must confirm to store the value.

Please consider that we might have usermanagement RBAC where we want to limit users to decrypt values.