PHRAS-3950 bin/maintenance clean never connected users #510

Job	Run time
build phraseanet-nginx / build	2m 32s
build phraseanet-setup / build	4m 4s
build phraseanet-elasticsearch / build	36s
build phraseanet-db / build	24s
build phraseanet-fpm / build	3m 26s
build phraseanet-worker / build	3m 45s
unit test	10m 3s
	24m 50s

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