[Coquelicot] Some patches

[Antonio Terceiro]

FWIW, I have read the patches and they look good to me. The only issue I have
is below:

On Tue, Jul 24, 2018 at 10:32:18AM +0200, ng wrote:
> @@ -142,7 +155,9 @@ module Coquelicot
>      def read_link(src)
>        File.open(links_path) do |f|
>          until f.eof?
> -          return $1 if f.readline =~ /^#{Regexp.escape(src)}\s+(.+)$/
> +          if m = f.readline.match(/^#{Regexp.escape(src)}\s+(.+)$/)
> +            return m[1]
> +          end
>          end
>        end
>        nil

This is unrelated to the lockfile usage refactoring patch, even though it's IMO
a change that makes the code more clear. I would put it into a separate patch.
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