add list, delete and edit comment of SSH public keys

- add sshkeys to hostingpackage detail view context
- implement new osusers.forms.EditSshPublicKeyCommentForm
- implement new views ListSshPublicKeys, DeleteSshPublicKey and
  EditSshPublicKeyComment
- add new URL patterns 'list_ssh_keys', 'edit_ssh_key_comment' and
  'delete_ssh_key'
- link from hosting package detail view to 'list_ssh_keys' when there are
  SSH keys assigned to the shown hosting package
- add new templates osusers/sshpublickey_list.html,
  osusers/sshpublickey_confirm_delete.html and
  osusers/sshpublickey_edit_comment
- add operating system user output to template
  osusers/sshpublickey_create.html
- add changelog entry

gnuviechadmin/templates/osusers/sshpublickey_edit_comment.html

@@ -0,0 +1,30 @@
+{% extends "osusers/base.html" %}
+{% load i18n crispy_forms_tags %}
+
+{% block title %}{{ block.super }} - {% spaceless %}
+{% if user == customer %}
+{% blocktrans %}Edit Comment of SSH Public Key for Operating System User {{ osuser }}{% endblocktrans %}
+{% else %}
+{% blocktrans with full_name=customer.get_full_name %}Edit Comment of SSH Public Key for Operating System User {{ osuser }} of Customer {{ full_name }}{% endblocktrans %}
+{% endif %}
+{% endspaceless %}{% endblock title %}
+
+{% block page_title %}{% spaceless %}
+{% if user == customer %}
+{% blocktrans %}Edit Comment of Public Key <small>for Operating System User {{ osuser }}</small>{% endblocktrans %}
+{% else %}
+{% blocktrans with full_name=customer.get_full_name %}Edit Comment of SSH Public Key <small>for Operating System User {{ osuser }} of Customer {{ full_name }}</small>{% endblocktrans %}
+{% endif %}
+{% endspaceless %}{% endblock page_title %}
+
+{% block content %}
+{% crispy form %}
+{% endblock content %}
+
+{% block extra_js %}
+<script type="text/javascript">
+$(document).ready(function() {
+  $('input[type=text]').first().focus().select();
+});
+</script>
+{% endblock extra_js %}