Use -X when loading structure.sql via psql

[dark-panda]

Use the -X when loading structure.sql via psql. psql will load the ~/.psqlrc file which may contain settings that cause psql to block or otherwise cause undesired or unexpected behaviour.

[rails-bot]

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[kamipo]

Can you address CI failure caused by changed arguments?
https://travis-ci.org/rails/rails/jobs/434032071

[dark-panda]

Ugh, sorry, tests fixed, patch rerolled and pushed. :/