If `router.request_context.host` is defined in `parameters.yml` and if this
key is used in `globals` section of twig bundle then the value registered in the
DIC/parameters is the default value (`localhost`).
It occurs because generall the framework bundle is defined before the twig
bundle. So after the first loop, the (user) value registered in the
`ContainerBuilder` is overridden by the default value of the framework bundle.
And so, when it comes the time to process twig bundle, the last one gets the
default value, and not the user value.
This patch force the merge of default value, but give an highest precedence of
user parameters for each extensions.
The Config component is a hard dependency for the loaders (but loaders
themselves are optional); all other classes should not have a hard dep
on Config. The introduction of a new flag allows to remove this
dependency.
This commit also fixes skipped test dependencies.
How to upgrade?
For XML configuration files:
* All extensions should now use the config tag (this is just a convention as
the YAML configurations files do not use it anymore):
* The previous change means that the doctrine and security bundles now are
wrapped under a main "config" tag:
<doctrine:config>
<doctrine:orm />
<doctrine:dbal />
</doctrine:config>
<security:config>
<security:acl />
...
</security:config>
For YAML configuration files:
* The main keys have been renamed as follows:
* assetic:config -> assetic
* app:config -> framework
* webprofiler:config -> web_profiler
* doctrine_odm.mongodb -> doctrine_mongo_db
* doctrine:orm -> doctrine: { orm: ... }
* doctrine:dbal -> doctrine: { dbal: ... }
* security:config -> security
* security:acl -> security: { acl: ... }
* twig.config -> twig
* zend.config -> zend
