Change branch namespace 'suites' to 'devuan' for devuan build branches
There are a number of reasons for this:
The debian developers that introduced the git/vcs tools to the debian workflow suggest it. Also it's one of the recommendations in DEP14 - http://dep.debian.net/deps/dep14/ "Recommended layout for Git packaging repositories" under the section Vendor Namespaces.
This provides clarity when we maintain packages directly for Devuan derivatives or even where our repository is used for also maintaining debian, ubuntu or other distribution packages.
It paves the way for adding personal package archives to our build system.