Make sure the parent output folder exists

Also update the argparse help text for the --discordant-vcf flag to
refer to a regular VCF file, instead of a gzipped VCF file.
1 job for testing in 22 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #4407
docker
build

00:00:22

 
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failed
build Test
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