Instead of just depending on the txt file from the blockfinder home cache dir providing the correct results, make one of the tests fetch the file from iso.org. This means that if the iso.org service breaks, the tests should pick up on the breakage.
Instead of just depending on the txt file from the blockfinder home cache dir providing the correct results, make one of the tests fetch the file from iso.org.
This means that if the iso.org service breaks, the tests should pick up on the breakage.

Signed-off-by: dave bl <0352a8acc949c7df21fec16e566ba9a74e797a97@d1b.org>

ioerror/blockfinder,Starefossen/docker-blockfinder,d1b/blockfinder,d1b/blockfinder,Starefossen/docker-blockfinder,ioerror/blockfinder