Determine if principal is empty (#1025)

* rename from DatasourceUserMapper to DataSourceUserMapper

* add unit test in UserMapper and WorkerGroupMapper

* change cn.escheduler to org.apache.dolphinscheduler

* add unit test in UdfFuncMapperTest

* add unit test in UdfFuncMapperTest

* remove DatabaseConfiguration

* add ConnectionFactoryTest

* cal duration in processInstancesList

* change desc to description

* change table name in mysql ddl

* change table name in mysql ddl

* change escheduler to dolphinscheduler

* change escheduler to dolphinscheduler

* change escheduler to dolphinscheduler

* remove log4j-1.2-api and modify AlertMapperTest

* remove log4j-1.2-api

* Add alertDao to spring management

* Add alertDao to spring management

* get SqlSessionFactory from MybatisSqlSessionFactoryBean

* get processDao by DaoFactory

* read druid properties in ConneciontFactory

* read druid properties in ConneciontFactory

* change get alertDao by spring to DaoFactory

* add log4j to resolve #967

* resole verify udf name error and delete udf error

* Determine if principal is empty

dolphinscheduler-common/src/main/java/org/apache/dolphinscheduler/common/job/db/SparkDataSource.java

@@ -42,7 +42,11 @@ public class SparkDataSource extends BaseDataSource {
       jdbcUrl += "/";
     }
 
-    jdbcUrl += getDatabase() + ";principal=" + getPrincipal();
+    jdbcUrl += getDatabase();
+
+    if (StringUtils.isNotEmpty(getPrincipal())){
+      jdbcUrl += ";principal=" + getPrincipal();
+    }
 
     if (StringUtils.isNotEmpty(getOther())) {
       jdbcUrl += ";" + getOther();