Fixes influxdata#647. Also moved query builder api tests to sub package to catch access issues. (influxdata#674)

Author: ooktay

src/main/java/org/influxdb/querybuilder/SubQuery.java

@@ -12,7 +12,7 @@ T getParent() {
     return parent;
   }
 
-  T close() {
+  public T close() {
     parent.setSubQuery(this);
     return parent;
   }

src/test/java/org/influxdb/querybuilder/AppenderTest.java renamed to src/test/java/org/influxdb/querybuilder/api/AppenderTest.java

@@ -1,9 +1,11 @@
-package org.influxdb.querybuilder;
+package org.influxdb.querybuilder.api;
 
 import static org.influxdb.querybuilder.BuiltQuery.QueryBuilder.eq;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
 import java.util.Collections;
+
+import org.influxdb.querybuilder.Appender;
 import org.junit.jupiter.api.Test;
 
 public class AppenderTest {

src/test/java/org/influxdb/querybuilder/BuiltQueryTest.java renamed to src/test/java/org/influxdb/querybuilder/api/BuiltQueryTest.java

@@ -1,4 +1,4 @@
-package org.influxdb.querybuilder;
+package org.influxdb.querybuilder.api;
 
 import static org.influxdb.querybuilder.BuiltQuery.QueryBuilder.*;
 import static org.influxdb.querybuilder.Operations.ADD;
@@ -10,6 +10,8 @@
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import org.influxdb.dto.Query;
+import org.influxdb.querybuilder.RawText;
+import org.influxdb.querybuilder.Where;
 import org.junit.jupiter.api.Test;
 
 public class BuiltQueryTest {

src/test/java/org/influxdb/querybuilder/SelectionSubQueryImplTest.java renamed to src/test/java/org/influxdb/querybuilder/api/SelectionSubQueryImplTest.java

@@ -1,4 +1,4 @@
-package org.influxdb.querybuilder;
+package org.influxdb.querybuilder.api;
 
 import static org.influxdb.querybuilder.BuiltQuery.QueryBuilder.*;
 import static org.influxdb.querybuilder.Operations.ADD;