PHRAS-4062: admin users delete and request improvement #926

Job	Run time
build phraseanet-fpm / build	4m 38s
build phraseanet-nginx / build	2m 50s
build phraseanet-elasticsearch / build	21s
build phraseanet-db / build	34s
build phraseanet-setup / build	3m 36s
build phraseanet-worker / build	3m 57s
unit test	5m 44s
	21m 40s

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