Set "remove rule" field to be required in dialog

The dialog can be open from: the "Firewalls"->"Firewall Policies"
->"More" button of a policy->"Remove Rule"

The "remove rule" field should be required, otherwise, user will
hit error when no rule is select. Removed "required=False",
because it is default to True.

Added 'btn-danger' to the button style

Change-Id: Ifa21419bc93818335057bb16ed2683994c6efee7
Closes-Bug: #1252996

openstack_dashboard/dashboards/project/firewalls/forms.py

@@ -258,8 +258,7 @@ class InsertRuleToPolicy(forms.SelfHandlingForm):
 
 
 class RemoveRuleFromPolicy(forms.SelfHandlingForm):
-    firewall_rule_id = forms.ChoiceField(label=_("Remove Rule"),
-                                         required=False)
+    firewall_rule_id = forms.ChoiceField(label=_("Remove Rule"))
 
     failure_url = 'horizon:project:firewalls:index'
 

openstack_dashboard/dashboards/project/firewalls/tables.py

@@ -114,7 +114,7 @@ class InsertRuleToPolicyLink(tables.LinkAction):
 class RemoveRuleFromPolicyLink(tables.LinkAction):
     name = "removerule"
     verbose_name = _("Remove Rule")
-    classes = ("ajax-modal", "btn-update",)
+    classes = ("ajax-modal", "btn-danger",)
 
     def get_link_url(self, policy):
         base_url = reverse("horizon:project:firewalls:removerule",