[CentOS-devel] [PATCH] handle detached HEAD in get_sources and more

This patch handles the detached HEAD case, by using git branch --contains
HEAD to get the branch (or a list of possible branches).

It also adds a option to specify the branch in case this logic fails. Also
there is an option to override the base source url for downloading.

While I was at it, I adjusted some checks so that the script will run even
if the name of the checkout directory is not $packagename.
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