Request host auth to use password

This is required for non superusers to use FDW's. See
https://www.postgresql.org/docs/11/postgres-fdw.html#id-1.11.7.42.10

.travis.yml

@@ -24,7 +24,7 @@ before_install:
   - sudo apt-get install -y --allow-unauthenticated postgresql-$POSTGRESQL_VERSION-postgis-$POSTGIS_VERSION postgresql-$POSTGRESQL_VERSION-postgis-$POSTGIS_VERSION-scripts postgis postgresql-plpython-$POSTGRESQL_VERSION
   - sudo pg_dropcluster --stop $POSTGRESQL_VERSION main
   - sudo rm -rf /etc/postgresql/$POSTGRESQL_VERSION /var/lib/postgresql/$POSTGRESQL_VERSION
-  - sudo pg_createcluster -u postgres $POSTGRESQL_VERSION main -- -A trust
+  - sudo pg_createcluster -u postgres $POSTGRESQL_VERSION main -- --auth-local trust --auth-host password
   - sudo /etc/init.d/postgresql start $POSTGRESQL_VERSION || sudo journalctl -xe
   - sudo pip install redis==2.4.9
 script: