Add parameter to allow usage of another MySQL host than localhost
localhost seems to be hard coded in the code here : https://gitlab.ow2.org/ow2/mrl/-/blob/master/webapp/src/main/java/org/ow2/treewebapp/database/DatasetFactory.java#L107
It should be modified to be able to replace localhost with a dedicated value in https://gitlab.ow2.org/ow2/mrl/-/blob/master/webapp/conf/mysql.properties.dist
with a parameter name which could be host