Neal wanted this to work - he tried using global_description_scm
and global_description_path in the initial PR - but it wasn't
wired up to work. This should make it possible to set
`kiwibuild_description_scm` and `kiwibuild_description_path`.
It also technically lets you set `global_` for both, since the
`get_config` implementation is very generic, but it doesn't add
it to the checks, so you'd still get an "unrecognized config
option" warning, I think. It seems appropriate to encourage
setting this as a phase-level option rather than a global one
since it seems quite specific to the kiwibuild phase.
Merges: https://pagure.io/pungi/pull-request/1737
Signed-off-by: Adam Williamson <awilliam@redhat.com>
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