PrestoS3FileSystemITCase#testConfigKeysForwarding fails on travis

Tests run: 3, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 5.838 sec <<< FAILURE! - in org.apache.flink.fs.s3presto.PrestoS3FileSystemITCase
testConfigKeysForwarding(org.apache.flink.fs.s3presto.PrestoS3FileSystemITCase)  Time elapsed: 1.613 sec  <<< ERROR!
java.lang.RuntimeException: S3 credentials not configured
	at com.facebook.presto.hive.PrestoS3FileSystem.getAwsCredentialsProvider(PrestoS3FileSystem.java:702)
	at com.facebook.presto.hive.PrestoS3FileSystem.createAmazonS3Client(PrestoS3FileSystem.java:628)
	at com.facebook.presto.hive.PrestoS3FileSystem.initialize(PrestoS3FileSystem.java:212)
	at org.apache.flink.runtime.fs.hdfs.AbstractFileSystemFactory.create(AbstractFileSystemFactory.java:56)
	at org.apache.flink.core.fs.FileSystem.getUnguardedFileSystem(FileSystem.java:395)
	at org.apache.flink.core.fs.FileSystem.get(FileSystem.java:318)
	at org.apache.flink.core.fs.Path.getFileSystem(Path.java:298)
	at org.apache.flink.fs.s3presto.PrestoS3FileSystemITCase.testConfigKeysForwarding(PrestoS3FileSystemITCase.java:84)