PHRAS-4062: admin users delete and request improvement #973

Job	Run time
build phraseanet-worker / build	3m 50s
build phraseanet-db / build	20s
build phraseanet-elasticsearch / build	20s
build phraseanet-fpm / build	3m 50s
build phraseanet-nginx / build	2m 49s
build phraseanet-setup / build	3m 59s
unit test	2m 17s
	17m 25s

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