Add new oslo.middleware package.
Add new oslo.middleware package.

This is now required by Nova...

hguemar/rdoinfo,trown/rdoinfo,eggmaster/rdoinfo,derekhiggins/rdoinfo,rdo-management/rdoinfo,apevec/rdoinfo-Kilo,javierpena/rdoinfo,hguemar/rdoinfo-Kilo,javierpena/rdoinfo-Kilo,xbezdick/rdoinfo,redhat-openstack/rdoinfo