Fix idempotency with pulpcore's migrations

puppet-pulpcore can no longer guarantee idempotency and reliably migrate
the database[1]. An option[2] was introduced to pretend it's idempotent,
which in upgrades may break but is good enough for CI.

[1]: theforeman/puppet-pulpcore@f8d0dc6
[2]: theforeman/puppet-pulpcore@0004d05

spec/acceptance/hieradata/common.yaml

@@ -4,3 +4,6 @@ foreman_proxy::manage_puppet_group: false
 foreman_proxy::puppet: false
 foreman_proxy::puppetca: false
 foreman_proxy::ssl_port: 9090
+
+# Fix idempotency in pulpcore
+pulpcore::database::always_run_migrations: false