PHRAS-4062: admin users delete and request improvement #928

Job	Run time
build phraseanet-elasticsearch / build	42s
build phraseanet-nginx / build	3m 13s
build phraseanet-db / build	36s
build phraseanet-fpm / build	3m 45s
build phraseanet-setup / build	4m 12s
build phraseanet-worker / build	3m 41s
unit test	5m 47s
	21m 56s

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