- 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
