Issue40023 rm measurement attempt

Already deployed in longclaw's sbws. This is the 1st bw file header in longclaw generated with this branch.

1606219520
version=1.4.0
destinations_countries=ZZ
earliest_bandwidth=2020-11-19T12:37:52
file_created=2020-11-24T12:37:50
generator_started=2020-11-24T12:36:59
latest_bandwidth=2020-11-24T12:05:20
minimum_number_eligible_relays=3985
minimum_percent_eligible_relays=60
number_consensus_relays=6641
number_eligible_relays=6855
percent_eligible_relays=103
recent_consensus_count=1
recent_measurements_excluded_error_count=554
recent_measurements_excluded_few_count=0
recent_measurements_excluded_near_count=0
recent_measurements_excluded_old_count=0
scanner_country=US
software=sbws
software_version=1.1.0+180.g0e64ffad
time_to_report_half_network=208311
tor_version=0.4.4.6