Updated openstack/openstack
Project: openstack-dev/pbr  02aeac0b1463926cec439b6eb0cd1d9b7dab1d8c
null
Add support for nested requirements files

pip supports requirements files with a line such as:

-r other-requirements.txt

for specifying nested requirements files.  Adding support to pbr
should be helpful with handling optional dependencies in projects
better, by allowing us to split the requirements files and then
merge them back together using -r lines.

Change-Id: I80e081b2229cc81eed26533c50afb07dc98a1db1