Remove the selector from the top bar

Since Tuskar-UI is going to be used in an environment where
the selector doesn't make any sense and is useless, we can
remove it. I do it by overriding the definitions for template
tags that are used to generate it.

Change-Id: I57abc9df5dbf5219ef10ea2f03ca3538d110d427

tuskar_ui/infrastructure/static/infrastructure/scss/infrastructure.scss

@@ -11,11 +11,6 @@
 @import "_index_pages";
 @import "_individual_pages";
 
-// hide the project switcher from the top bar
-#tenant_switcher {
-    visibility: hidden;
-}
-
 // Some tables should not have a title because it just repeats the page title.
 .no-table-title h3.table_title {
     display: none;

tuskar_ui/infrastructure/templatetags/context_selection.py

@@ -0,0 +1,41 @@
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from __future__ import absolute_import
+
+from django import template
+
+
+register = template.Library()
+
+# Overwrite the selector code from OpenStack Dashboard, so that the
+# selector doesn't appear.
+
+
+@register.simple_tag()
+def show_overview(*args, **kwargs):
+    return '<span class="context-overview"></span>'
+
+
+@register.simple_tag()
+def show_domain_list(*args, **kwargs):
+    return ''
+
+
+@register.simple_tag()
+def show_project_list(*args, **kwargs):
+    return ''
+
+
+@register.simple_tag()
+def show_region_list(*args, **kwargs):
+    return ''