diff --git a/.zuul.yaml b/.zuul.yaml
index 6bd807e03..7d9e219f4 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -70,7 +70,8 @@
       - name: openstack/designate-tempest-plugin
         override-checkout: 0.7.0
       - openstack/python-designateclient
-      - openstack/tempest
+      - name: openstack/tempest
+        override-checkout: stein-last
     run: playbooks/legacy/designate-devstack-base/run.yaml
     post-run: playbooks/legacy/designate-devstack-base/post.yaml
     timeout: 4200
@@ -180,7 +181,6 @@
     templates:
       - designate-devstack-jobs
       - openstack-cover-jobs
-      - openstack-lower-constraints-jobs
       - openstack-python-jobs
       - openstack-python35-jobs
       - openstack-python36-jobs
diff --git a/devstack/designate_plugins/backend-pdns4 b/devstack/designate_plugins/backend-pdns4
index d0cf01dd3..adf9ae7cb 100644
--- a/devstack/designate_plugins/backend-pdns4
+++ b/devstack/designate_plugins/backend-pdns4
@@ -32,25 +32,6 @@ fi
 # install_designate_backend - install any external requirements
 function install_designate_backend {
     if is_ubuntu; then
-        GetOSVersion
-        if  [ "$os_CODENAME" = "trusty" ]; then
-            sudo tee /etc/apt/sources.list.d/pdns.list > /dev/null <<EOF
-deb [arch=amd64] http://repo.powerdns.com/ubuntu trusty-auth-40 main
-EOF
-            sudo tee /etc/apt/preferences.d/pdns > /dev/null <<EOF
-Package: pdns-*
-Pin: origin repo.powerdns.com
-Pin-Priority: 600
-EOF
-            curl https://repo.powerdns.com/FD380FBB-pub.asc | sudo apt-key add - &&
-            sudo apt-get update
-        elif [ "$os_CODENAME" = "xenial" ]; then
-            echo "Use PDNS4 from apt repo"
-        elif [ "$os_CODENAME" = "bionic" ]; then
-            echo "Use PDNS4 from apt repo"
-        else
-            die $LINENO "PDNS4 backend only supports bionic, trusty or xenial"
-        fi
         PDNS=pdns-server
     else
         die $LINENO "PDNS4 Backend plugin backend only supports Ubuntu"
@@ -117,7 +98,6 @@ slave=yes
 cache-ttl=0
 query-cache-ttl=0
 negquery-cache-ttl=0
-out-of-zone-additional-processing=no
 webserver=yes
 webserver-address=$DESIGNATE_SERVICE_HOST
 webserver-allow-from=$DESIGNATE_SERVICE_HOST,127.0.0.1,::1
@@ -166,7 +146,7 @@ function init_designate_backend {
     # (Re)create designate_pdns database
     recreate_database designate_pdns utf8
     if is_service_enabled mysql; then
-            sudo mysql -u root designate_pdns < $DESIGNATE_PLUGINS/backend-pdns4-mysql-db.sql
+            sudo mysql -u$DATABASE_USER -p$DATABASE_PASSWORD -h$MYSQL_HOST designate_pdns < $DESIGNATE_PLUGINS/backend-pdns4-mysql-db.sql
     elif is_service_enabled postgresql; then
             sudo psql -U root -d designate_pdns -f $DESIGNATE_PLUGINS/backend-pdns4-pgsql-db.sql
     else
diff --git a/lower-constraints.txt b/lower-constraints.txt
deleted file mode 100644
index 4cacf0ef0..000000000
--- a/lower-constraints.txt
+++ /dev/null
@@ -1,168 +0,0 @@
-alabaster==0.7.10
-alembic==0.9.8
-amqp==2.2.2
-appdirs==1.4.3
-asn1crypto==0.24.0
-Babel==2.3.4
-bandit==1.1.0
-bcrypt==3.1.4
-beautifulsoup4==4.6.0
-blockdiag==1.5.3
-cachetools==2.0.1
-certifi==2018.1.18
-cffi==1.11.5
-chardet==3.0.4
-click==6.7
-cliff==2.11.0
-cmd2==0.8.1
-contextlib2==0.5.5
-coverage==4.0
-cryptography==2.1.4
-debtcollector==1.2.0
-decorator==4.2.1
-deprecation==2.0
-dnspython3==1.12.0
-dnspython==1.14.0
-doc8==0.6.0
-docutils==0.14
-dogpile.cache==0.6.5
-dulwich==0.19.0
-enum-compat==0.0.2
-eventlet==0.18.2
-extras==1.0.0
-fasteners==0.14.1
-fixtures==3.0.0
-flake8==2.5.5
-Flask==0.10
-funcparserlib==0.3.6
-future==0.16.0
-futurist==1.2.0
-gitdb2==2.0.3
-GitPython==2.1.8
-greenlet==0.4.10
-hacking==0.12.0
-idna==2.6
-imagesize==1.0.0
-iso8601==0.1.12
-itsdangerous==0.24
-Jinja2==2.10
-jmespath==0.9.3
-jsonpatch==1.21
-jsonpointer==2.0
-jsonschema==2.6.0
-kazoo==2.4.0
-keystoneauth1==3.4.0
-keystonemiddleware==4.17.0
-kombu==4.1.0
-linecache2==1.0.0
-logutils==0.3.5
-Mako==1.0.7
-MarkupSafe==1.0
-mccabe==0.2.1
-mock==2.0.0
-monasca-statsd==1.1.0
-monotonic==1.4
-mox3==0.25.0
-msgpack==0.5.6
-munch==2.2.0
-netaddr==0.7.18
-netifaces==0.10.6
-openstackdocstheme==1.20.0
-openstacksdk==0.12.0
-os-api-ref==1.5.0
-os-client-config==1.29.0
-os-service-types==1.2.0
-os-testr==1.0.0
-os-win==3.0.0
-osc-lib==1.10.0
-oslo.cache==1.29.0
-oslo.concurrency==3.26.0
-oslo.config==5.2.0
-oslo.context==2.19.2
-oslo.db==4.27.0
-oslo.i18n==3.15.3
-oslo.log==3.36.0
-oslo.messaging==5.29.0
-oslo.middleware==3.31.0
-oslo.policy==1.30.0
-oslo.reports==1.18.0
-oslo.rootwrap==5.8.0
-oslo.serialization==2.18.0
-oslo.service==1.24.0
-oslo.upgradecheck==0.1.0
-oslo.utils==3.33.0
-oslo.versionedobjects==1.31.2
-oslotest==3.2.0
-packaging==17.1
-paramiko==2.4.1
-Paste==2.0.2
-PasteDeploy==1.5.0
-pbr==2.0.0
-pecan==1.0.0
-pep8==1.5.7
-pika-pool==0.1.3
-pika==0.10.0
-Pillow==5.0.0
-prettytable==0.7.2
-psutil==5.4.3
-pyasn1==0.4.2
-pycadf==2.7.0
-pycparser==2.18
-pyflakes==0.8.1
-Pygments==2.2.0
-pyinotify==0.9.6
-PyNaCl==1.2.1
-pyparsing==2.2.0
-pyperclip==1.6.0
-python-dateutil==2.7.0
-python-designateclient==2.7.0
-python-editor==1.0.3
-python-keystoneclient==3.15.0
-python-memcached==1.56
-python-mimeparse==1.6.0
-python-neutronclient==6.7.0
-python-subunit==1.2.0
-pytz==2018.3
-PyYAML==3.12
-reno==2.7.0
-repoze.lru==0.7
-requests-mock==1.2.0
-requests==2.14.2
-requestsexceptions==1.4.0
-restructuredtext-lint==1.1.3
-rfc3986==1.1.0
-Routes==2.4.1
-simplejson==3.13.2
-six==1.10.0
-smmap2==2.0.3
-snowballstemmer==1.2.1
-Sphinx==1.6.5
-sphinxcontrib-blockdiag==1.5.5
-sphinxcontrib-httpdomain==1.6.1
-sphinxcontrib-websupport==1.0.1
-sqlalchemy-migrate==0.11.0
-SQLAlchemy==1.0.10
-sqlparse==0.2.4
-statsd==3.2.2
-stestr==2.0.0
-stevedore==1.20.0
-suds-jurko==0.6
-tempest==17.1.0
-Tempita==0.5.2
-tenacity==4.4.0
-testresources==2.0.1
-testscenarios==0.4
-testtools==2.2.0
-tooz==1.58.0
-traceback2==1.4.0
-unittest2==1.1.0
-urllib3==1.22
-vine==1.1.4
-voluptuous==0.11.1
-waitress==1.1.0
-webcolors==1.8.1
-WebOb==1.7.1
-WebTest==2.0.27
-Werkzeug==0.9
-wrapt==1.10.11
-zake==0.1.6
diff --git a/tox.ini b/tox.ini
index 3f05700a6..17f041ab4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -187,11 +187,3 @@ exclude = .venv,.git,.tox,dist,doc,*lib/python*,*egg,build,tools,.ropeproject
 [hacking]
 local-check-factory = designate.hacking.checks.factory
 import_exceptions = designate.i18n
-
-[testenv:lower-constraints]
-basepython = python3
-install_command = pip install {opts} {packages}
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt