Project.pm: set core.logallrefupdates to false
In a bare repository core.logallrefupdates normally defaults to
false. However, some Git commands will actually behave as though
it's set to true if it's left unset even in a bare repository.
While it's unlikely Girocco would be running any of these commands,
should an administrator run them in a repository, a repository could
end up with ref logs that would interfere with efficient gc.
Therefore always set core.logallrefupdates explicitly to false when
we initially create the repository.
Signed-off-by: Kyle J. McKay <mackyle@gmail.com>