python-pyopenssl: Extend recipe to support Python 3

- Add Python 3 recipe
- Add native and nativesdk to BBCLASSEXTEND

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-pyopenssl.inc

@@ -12,7 +12,11 @@ PYPI_PACKAGE = "pyOpenSSL"
 PACKAGES =+ "${PN}-tests"
 FILES_${PN}-tests = "${libdir}/${PYTHON_DIR}/site-packages/OpenSSL/test"
 
-RDEPENDS_${PN} = "python-threading python-six python-cryptography"
+RDEPENDS_${PN} = " \
+    ${PYTHON_PN}-cryptography \
+    ${PYTHON_PN}-six \
+    ${PYTHON_PN}-threading \
+"
 RDEPENDS_${PN}-tests = "${PN}"
 
 BBCLASSEXTEND = "native nativesdk"