Fix issue for python_packages
Fix issue for python_packages

This bug is caused by commit https://review.openstack.org/#/c/155220/
Sections for python packages has been moved above, but at the last line
of attributes/default.rb. These packages will be reset to only contain
postgresql related things.

Closes-Bug: #1436682
Change-Id: Ic3eff66637e7f50eea43d7fd9065876976416702

krtyyy/cookbook-openstack-common,krtyyy/cookbook-openstack-common,openstack/cookbook-openstack-common,tomzo/cookbook-openstack-common,tomzo/cookbook-openstack-common,openstack/cookbook-openstack-common,tomzo/cookbook-openstack-common,krtyyy/cookbook-openstack-common