fix(server): Remove invalid references

Author: LYD031106

hugegraph-server/hugegraph-test/src/main/java/org/apache/hugegraph/unit/mysql/BaseMysqlUnitTest.java

@@ -20,15 +20,12 @@
 package org.apache.hugegraph.unit.mysql;
 
 import org.apache.commons.configuration2.Configuration;
-import org.apache.hugegraph.backend.store.BackendStore;
-import org.apache.hugegraph.backend.store.hbase.HbaseStoreProvider;
 import org.apache.hugegraph.backend.store.mysql.MysqlStoreProvider;
 import org.apache.hugegraph.config.HugeConfig;
 import org.apache.hugegraph.testutil.Utils;
 import org.apache.hugegraph.unit.BaseUnitTest;
 import org.apache.hugegraph.unit.FakeObjects;
 import org.junit.After;
-import org.junit.Before;
 
 public class BaseMysqlUnitTest extends BaseUnitTest {
 

hugegraph-server/hugegraph-test/src/main/java/org/apache/hugegraph/unit/mysql/MysqlTest.java

@@ -21,7 +21,6 @@
 
 import org.apache.hugegraph.backend.store.BackendStore;
 import org.apache.hugegraph.testutil.Assert;
-import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;