Remove useless debug message
Remove useless debug message

This is always printed even if nothing have to done:

http://logs.openstack.org/44/468844/17/gate/gate-telemetry-dsvm-integration-ceilometer-ubuntu-xenial/8f54c0e/logs/screen-gnocchi-metricd.txt.gz#_Jun_06_09_09_09_101487

Also we have something to do, we already print another more usefull
message:

"Processing measures for b03bed59-d1da-4db0-b9bf-adff3766d2a9"

gnocchixyz/gnocchi,leandroreox/gnocchi,gnocchixyz/gnocchi,sileht/gnocchi,leandroreox/gnocchi,sileht/gnocchi