Use postgres as the default setup db to make things easier for new us… #1141

Job	Run time
specs (shard.yml, 14, 1.10.0, false)	3m 34s
check_format	1m 1s
specs (shard.yml, 14, latest, false)	3m 37s
specs (shard.yml, 15, 1.10.0, false)	3m 40s
specs (shard.yml, 15, latest, false)	3m 18s
specs (shard.yml, 16, 1.10.0, false)	3m 41s
specs (shard.yml, 16, latest, false)	3m 48s
specs (shard.edge.yml, latest, 14, true)	3m 8s
specs (shard.override.yml, nightly, 14, true)	3m 32s
	29m 19s

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