Drop notification based designate integration.

Deprecated 18.02, removal for 18.05; superceeded by extension
driver.

Change-Id: Ia7117dbe6d06e40a3fa4c6cb9c56a0d89217bfd9

hooks/neutron_api_context.py

@@ -53,7 +53,6 @@ ETC_NEUTRON = '/etc/neutron'
 
 NOTIFICATION_TOPICS = [
     'notifications',
-    'notifications_designate'
 ]
 
 # Domain name validation regex which is used to certify that

tox.ini

@@ -27,6 +27,11 @@ basepython = python3.5
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 
+[testenv:py36]
+basepython = python3.6
+deps = -r{toxinidir}/requirements.txt
+       -r{toxinidir}/test-requirements.txt
+
 [testenv:pep8]
 basepython = python2.7
 deps = -r{toxinidir}/requirements.txt