PHRAS-4130 : upgrade mariadb to 5.11.11 #1171

Job	Run time
build phraseanet-elasticsearch / build	33s
build phraseanet-db / build	1m 1s
build phraseanet-fpm / build	4m 32s
build phraseanet-nginx / build	2m 52s
build phraseanet-setup / build	4m 5s
build phraseanet-worker / build	4m 24s
unit test	5m 54s
	23m 21s

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