mariadb entrypoint fix
mariadb entrypoint fix

I made a mistake and caused #MariaDB/mariadb-docker/issues/460

Correct fails to set password with MARIADB_ROOT_HOST=localhost

Corrects setting of root@localhost use to MARIADB_ROOT_PASSWORD_HASH,
 if set, and defers the setting until after /docker-entrypoint-initdb.d/
is processed.

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