Currently, there is no support for Microsoft DNS
in designate. This patch addresses this issue
by adding support for Microsoft DNS Server using
an agent backend in designate.
Change-Id: I8db1906e17e5fb20fa6f3e5d1f13b2d701f0c032
Implements: blueprint msdns-backend-support
Depends-On: I029747555a58e0a8e362b65e6c0c470cf2774e42
95f451dc8a