Supports merging configuration for the following files:

* kolla/globals.yml
* kolla/config/bifrost/bifrost.yml
* kolla/config/bifrost/dib.yml
* kolla/config/bifrost/servers.yml
* kolla/kolla-build.conf

Configuration is merged from the following sources:

* Kayobe source code
* Base Kayobe config
* Kayobe environment

Co-Authored-By: Will Szumski <will@stackhpc.com>
Change-Id: I552bd8f7853b2032954b372bf4476676dac3e271
Story: 2002009
Task: 42974