python-pyyaml 3.10: unbreak versioning

Using our own setup.py is great, but it should use the same version as the recipe, otherwise you get errors like these:

pkg_resources.DistributionNotFound: The 'PyYAML==3.10' distribution was not found and is required

Package python-pyyaml (3.10-r0.0) is installed on root and has the following files:
[..]
/usr/lib/python2.7/site-packages/PyYAML-3.06-py2.7.egg-info

Signed-off-by: Koen Kooi <koen.kooi@linaro.org>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>