mariadb-slap reporting 2x time for test sleep(1)

{{mariadb-slap -uroot -padmin --delimiter=";" --create-schema=dev --query="select sleep(1);" --concurrency=1 --iterations=1

Average number of seconds to run all queries: 2.000 seconds
Minimum number of seconds to run all queries: 2.000 seconds
Maximum number of seconds to run all queries: 2.000 seconds
Number of clients running queries: 1
Average number of queries per client: 1
}}

On linux, the correct time of 1 second is shown. This was a test case to convince QA to use mysqlslap/mariadb-slap in a mixed Mac/Windows/Linux dev team. For other statements, the different OS versions agree on the time.