[meta-python][PATCH] python-tornado: add missing python2 runtime deps

["S. Lockwood-Childs" <sjl@vctlabs.com>]

Tornado 4.3 needs a couple more backport modules to prevent tornado/gen.py
from bombing on import errors when running on python2 rather than python3.4

  ImportError: No module named singledispatch

  ImportError: No module named backports_abc

Fixed by creating python-singledispatch and python-backports-abc recipes
respectively and adding them to RDEPENDS.

Signed-off-by: S. Lockwood-Childs <sjl@vctlabs.com>
---
 .../python/python-backports-abc_0.4.bb                 | 18 ++++++++++++++++++
 .../python/python-singledispatch_3.4.0.3.bb            | 13 +++++++++++++
 .../recipes-devtools/python/python-tornado_4.3.bb      |  2 +-
 3 files changed, 32 insertions(+), 1 deletion(-)
 create mode 100644 meta-python/recipes-devtools/python/python-backports-abc_0.4.bb
 create mode 100644 meta-python/recipes-devtools/python/python-singledispatch_3.4.0.3.bb

diff --git a/meta-python/recipes-devtools/python/python-backports-abc_0.4.bb b/meta-python/recipes-devtools/python/python-backports-abc_0.4.bb
new file mode 100644
index 0000000..6a4d267
--- /dev/null
+++ b/meta-python/recipes-devtools/python/python-backports-abc_0.4.bb
@@ -0,0 +1,18 @@
+SUMMARY = "collections.abc from Python 3.4"
+DESCRIPTION = "A backport of recent additions to the 'collections.abc' module"
+
+LICENSE = "PSF"
+LIC_FILES_CHKSUM = "file://${WORKDIR}/LICENSE;md5=dd98d01d471fac8d8dbdd975229dba03"
+
+# pypi package doesn't have valid entry for license
+SRC_URI += "https://raw.githubusercontent.com/cython/backports_abc/master/LICENSE;name=license"
+
+SRC_URI[md5sum] = "0b65a216ce9dc9c1a7e20a729dd7c05b"
+SRC_URI[sha256sum] = "8b3e4092ba3d541c7a2f9b7d0d9c0275b21c6a01c53a61c731eba6686939d0a5"
+SRC_URI[license.md5sum] = "dd98d01d471fac8d8dbdd975229dba03"
+SRC_URI[license.sha256sum] = "0a4f3b38055f50f047a42521568fa6ddb9a5976c2884f6ae138796d0f71150ca"
+
+
+
+PYPI_PACKAGE = "backports_abc"
+inherit pypi setuptools
diff --git a/meta-python/recipes-devtools/python/python-singledispatch_3.4.0.3.bb b/meta-python/recipes-devtools/python/python-singledispatch_3.4.0.3.bb
new file mode 100644
index 0000000..87f46e5
--- /dev/null
+++ b/meta-python/recipes-devtools/python/python-singledispatch_3.4.0.3.bb
@@ -0,0 +1,13 @@
+SUMMARY = "functools.singledispatch from Python 3.4"
+DESCRIPTION = "PEP 443 proposed to expose a mechanism in the functools standard library module \
+in Python 3.4 that provides a simple form of generic programming known as single-dispatch \
+generic functions.  This library is a backport of this functionality to Python 2.6 - 3.3"
+
+LICENSE = "Apache-2.0"
+LIC_FILES_CHKSUM = "file://README.rst;md5=ee3cd67264adc7eb07981f3644dc17dc"
+
+SRC_URI[md5sum] = "af2fc6a3d6cc5a02d0bf54d909785fcb"
+SRC_URI[sha256sum] = "5b06af87df13818d14f08a028e42f566640aef80805c3b50c5056b086e3c2b9c"
+
+PYPI_PACKAGE = "singledispatch"
+inherit pypi setuptools
diff --git a/meta-python/recipes-devtools/python/python-tornado_4.3.bb b/meta-python/recipes-devtools/python/python-tornado_4.3.bb
index 55a48b8..d30f88f 100644
--- a/meta-python/recipes-devtools/python/python-tornado_4.3.bb
+++ b/meta-python/recipes-devtools/python/python-tornado_4.3.bb
@@ -1,3 +1,3 @@
 inherit pypi setuptools
 require python-tornado.inc
-RDEPENDS_${PN} += "${PYTHON_PN}-backports-ssl"
+RDEPENDS_${PN} += "${PYTHON_PN}-backports-ssl ${PYTHON_P}-backports-abc ${PYTHON_PN}-singledispatch"
-- 
1.9.1