The patch adds an extension which implements the procedure of upgrading
clusters from one major release to another. As a first step of the
procedure the extension provides an ability to create a seed cluster
with the same settings as the original.
Implements blueprint: nailgun-api-env-upgrade-extensions
Change-Id: I22d51a3ffd51a7c88bdcbde0eef6f47b65def1c8
a80bbf8b6e