openstore:schema:update gone crazy with Mariadb 10.2.7

[belgattitude]

After upgrade to MariadDB 10.2.7, a schema update is marking change for all tables about default column value.

Change in mariadb: https://jira.mariadb.org/browse/MDEV-13132

[belgattitude]

Downtracked to doctrine dbal.

Just made a P/R doctrine/dbal#2825. included in 2.7:

Till 2.7.x is released, I've added 2.7.x-dev as a trick

    "require": {
        "php": "^7.1",
        "doctrine/dbal": "2.7.x-dev as 2.6.4",
        "doctrine/common": "^2.7.0",
        "doctrine/orm": "^2.5.0",
        "gedmo/doctrine-extensions": "^2.4.28",
        "doctrine/data-fixtures": "^1.2.2",
        "symfony/console": "^2.6.0 || ^3.2.0"
    },