add view osusers.views.AddSshPublicKey

- implement new form osusers.forms.AddSshPublicKeyForm
- move message texts from osusers.admin to osusers.forms
- add new view osusers.views.AddSshPublicKey
- add new URL patter 'add_ssh_key' to osusers.urls
- add new template osusers/sshpublickey_create.html
- link from hosting package detail template to 'add_ssh_key'
- add changelog entry for new feature

gnuviechadmin/osusers/admin.py

@@ -12,6 +12,10 @@ from gvawebcore.forms import (
 )
 from taskresults.models import TaskResult
 
+from .forms import (
+    INVALID_SSH_PUBLIC_KEY,
+    DUPLICATE_SSH_PUBLIC_KEY_FOR_USER,
+)
 from .models import (
     AdditionalGroup,
     Group,
@@ -20,10 +24,6 @@ from .models import (
     User,
 )
 
-INVALID_SSH_PUBLIC_KEY = _('Invalid SSH public key data format.')
-DUPLICATE_SSH_PUBLIC_KEY_FOR_USER = _(
-    'This SSH public key is already assigned to this user.')
-
 
 class AdditionalGroupInline(admin.TabularInline):
     """