python-tornado: bump to 4.0.2

Add a hash file. Also remove obsolete Python dependency statement.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/python-tornado/Config.in

@@ -1,7 +1,7 @@
 config BR2_PACKAGE_PYTHON_TORNADO
 	bool "python-tornado"
-	depends on BR2_PACKAGE_PYTHON
-	select BR2_PACKAGE_PYTHON_ZLIB
+	select BR2_PACKAGE_PYTHON_ZLIB if BR2_PACKAGE_PYTHON # runtime
+	select BR2_PACKAGE_PYTHON3_ZLIB if BR2_PACKAGE_PYTHON3 # runtime
 	help
 	  Tornado is a Python web framework and asynchronous networking
 	  library, originally developed at FriendFeed.

package/python-tornado/python-tornado.hash

@@ -0,0 +1,2 @@
+# Locally computed:
+sha256  900c5124ebdb6598ca8e8a0c5888f41a5f14117952d5515258e3d20222b21bfa  tornado-4.0.2.tar.gz

package/python-tornado/python-tornado.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-PYTHON_TORNADO_VERSION = 3.1.1
+PYTHON_TORNADO_VERSION = 4.0.2
 PYTHON_TORNADO_SOURCE = tornado-$(PYTHON_TORNADO_VERSION).tar.gz
 PYTHON_TORNADO_SITE = https://pypi.python.org/packages/source/t/tornado
 PYTHON_TORNADO_LICENSE = Apache-2.0