refactor drupal-entry.pl (just SQL stuff)

Minimize scripts in drupal-entry.pl in a way that only have interactions with SQL database (that can only perform when container is running)

@esaumell would be nice if you check what code strictly stick to SQL database connection in drupal-entry.pl file

You can get inspired of what we achieved in guifi-api. In docker-entrypoint.sh is nearly empty, this means very fast initialization when docker container is downloaded

Posa un tag de baixa prioritat a aquesta issue però no la tanquis

[rgf1042]

Et passo el mòdul de Perl per treballar amb mysql (o mariadb):
http://search.cpan.org/dist/DBD-mysql/lib/DBD/mysql.pm