Fix py36 fail

- Fix py36 fail: Elasticsearch failed to start
- Remove non-voting for py36

Change-Id: Iad5163d5cb185a61a9bab7d8ad80ab12984f5f66

.zuul.yaml

@@ -9,10 +9,6 @@
     check:
       jobs:
         - openstack-tox-lower-constraints
-        - openstack-tox-py36:
-            voting: false
     gate:
       jobs:
         - openstack-tox-lower-constraints
-        - openstack-tox-py36:
-            voting: false

tools/test-setup.sh

@@ -7,7 +7,12 @@
 # This setup needs to be run by a user that can run sudo.
 
 sudo apt-get update
-sudo apt-get install -y default-jre
+. /etc/os-release
+if [[ $VERSION_CODENAME = bionic ]]; then
+    sudo apt-get install -y openjdk-8-jre
+else
+    sudo apt-get install -y default-jre
+fi
 wget https://download.elastic.co/elasticsearch/release/org/elasticsearch/distribution/deb/elasticsearch/2.3.2/elasticsearch-2.3.2.deb
 sudo dpkg -i elasticsearch-2.3.2.deb
 # Make 'elasticsearch' binary callable from within functional tests