This adds support for the optional blueprint section [customizations].
Use it like this:
[customizations]
hostname = yourhostnamehere
[[customizations.sshkey]]
user = root
key = root user key
Different versions of libgit2 act differently. Using TIME results in
some commits (like a revert) being listed correctly, but the rest being
listed in reverse order. Leaving it at the default works for
libgit2-0.26.3
This no longer uses the enabled configuration setting to select repos to
use. It uses everything in the repo_dir, and if system repos have not
been disabled it copies them into the repo_dir at startup, overwriting
the previous copy.
