In a consensus reached in a proposal for code review process
change [1], and proposed team structure policy document [2],
adding MAINTAINERS files in repositories.
Please note, that this file is written in YAML format in order
to allow further automation around code review process.
[1] http://lists.openstack.org/pipermail/openstack-dev/2015-August/072406.html
[2] https://review.openstack.org/#/c/225376/
Change-Id: I520d5285c2002818ce9e770d1fdc3265f9c36ebe