Filter out 'members' returned from HR system.
I found when looking over the code in the old card system that 'members' are not populated as being part of their organisation: https://gitlab.developers.cam.ac.uk/uis/devops/iam/card-database/card-system/blob/master/applications/plsql/univcard/DAILY.PKB#L848.
This is one of the causes of differences when using the University HR system to populate exports.
It seems best to filter out members at the card-client level, as it may be that other systems do want to read data about members from the University HR API.
Closes #27 (closed)