Support multi partition column when creating table (#1574)

When creating table with OLAP engine, use can specify multi parition columns.
eg:

PARTITION BY RANGE(`date`, `id`)
(
    PARTITION `p201701_1000` VALUES LESS THAN ("2017-02-01", "1000"),
    PARTITION `p201702_2000` VALUES LESS THAN ("2017-03-01", "2000"),
    PARTITION `p201703_all`  VALUES LESS THAN ("2017-04-01")
)

Notice that load by hadoop cluster does not support multi parition column table.

fe/src/test/java/org/apache/doris/load/loadv2/BrokerLoadJobTest.java

@@ -141,7 +141,7 @@ public class BrokerLoadJobTest {
             @Mock
             public void checkAndCreateSource(Database db, DataDescription dataDescription,
                                              Map<Long, Map<Long, List<Source>>> tableToPartitionSources,
-                                             boolean deleteFlag) {
+                                             boolean deleteFlag, EtlJobType jobType) {
             }
         };