Add some search and filtering improvment

• Add some default columns to table
• Update filtrering field in forms

plugins/netbox-rps-plugin/netbox_rps_plugin/templates/netbox_rps_plugin/httpheader/child.html

 {% extends 'generic/object.html' %}
 {% load helpers %}
 {% load render_table from django_tables2 %}
-{% load perms %}
 
 {% block extra_controls %}
   <a href="{% url 'plugins:netbox_rps_plugin:httpheader_add' %}?mapping={{ object.pk }}&return_url={{ object.get_absolute_url }}" class="btn btn-sm btn-primary">