* 3.3:
[DI] Fix infinite loop in InlineServiceDefinitionsPass
Do not cache cache attributes if `attributes` is in the context
Test that it do not remove the new flashes when displaying the existing ones
[HttpFoundation] AutExpireFlashBag should not clear new flashes
[FrameworkBundle][Serializer] Remove YamlEncoder definition if Yaml component isn't installed
[DI] Fix tracking of env vars in exceptions
[Form] Don't rely on if http-foundation isn't in FileType
Fix merge
substitute aliases in inline mappings
added ability for substitute aliases when mapping in YAML is on single line
[Console] Fix global console flag when used in chain
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.