reset test datasource back to h2

ebean-test/src/test/resources/ebean.properties

@@ -22,7 +22,7 @@ ebean.ddl.generate=true
 ebean.ddl.run=true
 ebean.ddl.header=-- Generated by ebean ${version} at ${timestamp}
 ebean.packages=org.tests,org.etest
-datasource.default=pg
+datasource.default=h2
 #datasource.h2.capturestacktrace=true
 
 ebean.dumpMetricsOnShutdown=true