Fix failure on TestDublinCoreStorage.testCopyDocument on mysql

java.lang.AssertionError: expected:<java.util.GregorianCalendar[time=1486537224000,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Etc/UTC",offset=0,dstSavings=0,useDaylight=false,transitions=0,lastRule=null],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2017,MONTH=1,WEEK_OF_YEAR=6,WEEK_OF_MONTH=2,DAY_OF_MONTH=8,DAY_OF_YEAR=39,DAY_OF_WEEK=4,DAY_OF_WEEK_IN_MONTH=2,AM_PM=0,HOUR=7,HOUR_OF_DAY=7,MINUTE=0,SECOND=24,MILLISECOND=0,ZONE_OFFSET=0,DST_OFFSET=0]> but was:<java.util.GregorianCalendar[time=1486537225000,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Etc/UTC",offset=0,dstSavings=0,useDaylight=false,transitions=0,lastRule=null],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2017,MONTH=1,WEEK_OF_YEAR=6,WEEK_OF_MONTH=2,DAY_OF_MONTH=8,DAY_OF_YEAR=39,DAY_OF_WEEK=4,DAY_OF_WEEK_IN_MONTH=2,AM_PM=0,HOUR=7,HOUR_OF_DAY=7,MINUTE=0,SECOND=25,MILLISECOND=0,ZONE_OFFSET=0,DST_OFFSET=0]>
	at org.junit.Assert.fail(Assert.java:88)
	at org.junit.Assert.failNotEquals(Assert.java:743)
	at org.junit.Assert.assertEquals(Assert.java:118)
	at org.junit.Assert.assertEquals(Assert.java:144)
	at org.nuxeo.ecm.core.test.StorageConfiguration.assertEqualsTimestamp(StorageConfiguration.java:372)
	at org.nuxeo.ecm.platform.dublincore.TestDublinCoreStorage.assertEqualsCalendar(TestDublinCoreStorage.java:411)
	at org.nuxeo.ecm.platform.dublincore.TestDublinCoreStorage.testCopyDocument(TestDublinCoreStorage.java:377)