CApath is about 20% faster than CAfile so use it, also
save the received certificates from the servers for later analysis
(proper hostname checking, looking for certificates sharing private key,
etc.)
Use the mechanism from cipherscan to find location of ca cert bundle
scan all the machines from top-1m.csv file, wait for completion
of all jobs
i=1 is an off-by-one-error
support top-1m.csv files with arbitrary number of sites
run scans for many hosts at a time, but don't run more than
specified amount
in case where default domain name doesn't resolve or doesn't have
port 443 open, retry with www. prefix
