Use AJAX to automatically show the key/certificate info

Problem/Motivation

The current form requires the user to paste the key into the form and then click "info" to submit the form, trigger a form error, and show the key info as a message.

Steps to reproduce

• Go to admin/config/system/keys/add
• Select Key Type "Public key/certificate"
• Add a PEM-encoded key in the "Key value" field
• Click "info" to get the key data.

  Proposed resolution

  Add some #ajax code to automatically pull the key/certificate information "on blur" of the Key value field, if possible. (The way the form is created may make this difficult.)

  User interface changes

  • Remove the info button
  • Add an element that shows the key/certificate info
  • Update the key/certificate info when focus is removed from the Key value field