python-pytest: Extend support to python 3

- Add Python 3 recipe
- Add native and nativesdk to BBCLASSEXTEND
- Change code style for RDEPENDS

Signed-off-by: Fabio Berton <fabio.berton@ossystems.com.br>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-python/recipes-devtools/python/python-pytest.inc

@@ -0,0 +1,16 @@
+SUMMARY = "Simple powerful teting with python"
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://LICENSE;md5=d8a5609608d9a5a180705b0fa298ae01"
+
+SRC_URI[md5sum] = "05165740ea50928e4e971378630163ec"
+SRC_URI[sha256sum] = "0d48d27a127644fbe7c8158157e08b35f8255045d4476df694b91eb3a8147e65"
+
+RDEPENDS_${PN} = " \
+    ${PYTHON_PN}-argparse \
+    ${PYTHON_PN}-debugger \
+    ${PYTHON_PN}-json \
+    ${PYTHON_PN}-py \
+    ${PYTHON_PN}-setuptools \
+"
+
+BBCLASSEXTEND = "native nativesdk"