collector: remove commented-out import from bcache collector
collector: remove commented-out import from bcache collector

Signed-off-by: Matt Layher <76528ff2e917253aa2211f68e4ca60b5b846dcf5@gmail.com>

prometheus/node_exporter,siavashs/node_exporter,siavashs/node_exporter,siavashs/node_exporter,prometheus/node_exporter,siavashs/node_exporter,prometheus/node_exporter