[csw-buildfarm] Catalog generation file lock

[Maciej (Matchek) Blizinski]

I modified the catalog generation script to create a lock and not proceed
the code generation is already running. Not that we had too many problems
with it in the past, but it's nice if the script itself takes care of that.

We could do the same for the experimental catalog generators, I often see
overlapping, potentially wedged cron jobs trying to generate experimental.

Maciej
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