add support for plan9 #744
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Make this compile (and work) by adding a file user_plan9.go. It's nearly identical to the posix version.
On plan9 the test TestCloseBadConn in conn_test.go was failing. The hardcoded localhost:5432 won't work (postgres isn't available on plan9). The README already encourages you to use environment variables to override database connection parameters, so this patch makes the code look at env vars.