Add ReceptorAddress to root urls

- Add database contraints to make sure addresses
are unique
If port is defined:
address, port, protocol, websocket_path are unique together

if port is not defined:
address, protocol, websocket_path are unique together

- Allow deleting address via API
- Add ReceptorAddressAccess to determine permissions
- awx-manage add_receptor_address returns changed: True
if successful

awx/api/urls/receptor_address.py

@@ -0,0 +1,17 @@
+# Copyright (c) 2017 Ansible, Inc.
+# All Rights Reserved.
+
+from django.urls import re_path
+
+from awx.api.views import (
+    ReceptorAddressesList,
+    ReceptorAddressDetail,
+)
+
+
+urls = [
+    re_path(r'^$', ReceptorAddressesList.as_view(), name='receptor_addresses_list'),
+    re_path(r'^(?P<pk>[0-9]+)/$', ReceptorAddressDetail.as_view(), name='receptor_address_detail'),
+]
+
+__all__ = ['urls']