style fixes

Author: cosminbasca

graalpython/com.oracle.graal.python.test/src/tests/test_thread.py

@@ -1,4 +1,4 @@
-# Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # The Universal Permissive License (UPL), Version 1.0

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/ThreadModuleBuiltins.java

@@ -58,7 +58,6 @@
 import com.oracle.graal.python.nodes.argument.keywords.ExecuteKeywordStarargsNode.ExpandKeywordStarargsNode;
 import com.oracle.graal.python.nodes.argument.positional.ExecutePositionalStarargsNode;
 import com.oracle.graal.python.nodes.call.CallNode;
-import com.oracle.graal.python.nodes.datamodel.IsCallableNode;
 import com.oracle.graal.python.nodes.function.PythonBuiltinBaseNode;
 import com.oracle.graal.python.nodes.function.PythonBuiltinNode;
 import com.oracle.graal.python.nodes.function.builtins.PythonUnaryBuiltinNode;