Tavis CI job failure for redhat

[noelmcloughlin]

See https://travis-ci.com/saltstack-formulas/postgres-formula/jobs/222406524

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    ----------
1246                 ID: postgresql-running
1247           Function: service.running
1248               Name: postgresql
1249             Result: False
1250            Comment: Service postgresql has been enabled, and is dead
1251            Started: 10:13:49.044635
1252           Duration: 6517.043 ms
1253            Changes:   
1254              ----------
1255              postgresql:
1256                  True