Update Django GPG app

Add keyword arguments to all calls. Rename URL parameters to be
explicit ("key_id"). Add key delete view test. Update tests
to use a mixin for repeated key creation code. Grant permissions
and access the proper way using self.grant_permission and
self.grant_access.

Signed-off-by: Roberto Rosario <Roberto.Rosario@mayan-edms.com>

mayan/apps/django_gpg/forms.py

@@ -44,6 +44,6 @@ class KeyDetailForm(DetailForm):
 
 class KeySearchForm(forms.Form):
     term = forms.CharField(
-        label=_('Term'),
-        help_text=_('Name, e-mail, key ID or key fingerprint to look for.')
+        help_text=_('Name, e-mail, key ID or key fingerprint to look for.'),
+        label=_('Term')
     )