Fix leaky connection testing
Fix leaky connection testing

We should see how many connections there are at the beginning of
testing each URL, not just when validate_urls is called. This fixes
a bug where one leak with cause all subsequent leak checks to fail.

solgenomics/sgn,solgenomics/sgn,solgenomics/sgn,solgenomics/sgn,solgenomics/sgn,solgenomics/sgn,solgenomics/sgn