backend: print more reasonable output from AWS hitcounter script
The original output looked like
Sending: 870 results from 1653911246 to 1653911667
Sending: 880 results from 1653908604 to 1653908967
Sending: 804 results from 1653911549 to 1653911968
Which is IMHO useless. I am changing it to
[1/98842] cloudwatch/E2PUZIRCXCOXTG.2021-12-07-15.00d7a244.gz (20 accesses)
[2/98842] cloudwatch/E2PUZIRCXCOXTG.2021-12-07-15.0116fd9c.gz (10 accesses)
[3/98842] cloudwatch/E2PUZIRCXCOXTG.2021-12-07-15.027cfed6.gz (7 accesses)