remove unneeded imports

Author: ron-gal

google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/admin/v2/it/BigtableMaterializedViewIT.java

@@ -24,22 +24,17 @@
 import com.google.api.gax.rpc.NotFoundException;
 import com.google.cloud.bigtable.admin.v2.BigtableInstanceAdminClient;
 import com.google.cloud.bigtable.admin.v2.BigtableTableAdminClient;
-import com.google.cloud.bigtable.admin.v2.models.CreateInstanceRequest;
 import com.google.cloud.bigtable.admin.v2.models.CreateMaterializedViewRequest;
 import com.google.cloud.bigtable.admin.v2.models.CreateTableRequest;
-import com.google.cloud.bigtable.admin.v2.models.Instance;
 import com.google.cloud.bigtable.admin.v2.models.MaterializedView;
-import com.google.cloud.bigtable.admin.v2.models.StorageType;
 import com.google.cloud.bigtable.admin.v2.models.Table;
 import com.google.cloud.bigtable.admin.v2.models.UpdateMaterializedViewRequest;
 import com.google.cloud.bigtable.test_helpers.env.EmulatorEnv;
 import com.google.cloud.bigtable.test_helpers.env.PrefixGenerator;
 import com.google.cloud.bigtable.test_helpers.env.TestEnvRule;
 import io.grpc.StatusRuntimeException;
-import java.io.IOException;
 import java.util.List;
 import java.util.logging.Logger;
-import org.junit.AfterClass;
 import org.junit.Before;
 import org.junit.BeforeClass;
 import org.junit.ClassRule;