devel/ros-rosdistro: Update to 0.9.0

Release notes:

https://github.com/ros-infrastructure/rosdistro/blob/0.9.0/CHANGELOG.rst

The main changes are mostly meta changes, tests run with pytest and
unittest.mock instead of nose and the release distributions are
updated. I've added this in since nose wasn't a TEST_DEPENDS earlier.

Also Python 2.7 support is fully removed.

PR:		264849