Fix getting report output from a remote node

This is a very partial backport of a fix for MID-6079.

If the nodeRef in report output is correct, the file should be now
remotely retrievable.

model/report-impl/src/main/java/com/evolveum/midpoint/report/impl/ReportManagerImpl.java

@@ -53,6 +53,7 @@
 import org.springframework.stereotype.Service;
 
 import javax.annotation.PostConstruct;
+import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import javax.xml.datatype.Duration;
 import javax.xml.datatype.XMLGregorianCalendar;
@@ -432,6 +433,7 @@ public InputStream getReportOutputData(String reportOutputOid, OperationResult p
                 clusterExecutionHelper.execute(reportOutput.getNodeRef().getOid(), (client, result1) -> {
                     client.path(ClusterRestService.REPORT_FILE_PATH);
                     client.query(ClusterRestService.REPORT_FILE_FILENAME_PARAMETER, fileName);
+                    client.accept(MediaType.APPLICATION_OCTET_STREAM_TYPE);
                     Response response = client.get();
                     Response.StatusType statusInfo = response.getStatusInfo();
                     LOGGER.debug("Retrieving report output file ({}) from {} finished with status {}: {}",