…yholm)This PR was submitted for the 4.3 branch but it was squashed and merged into the 3.4 branch instead (closes#11813).Discussion----------[Cache] Make sure the chain cache configuration worksI just tried the configuration and noticed a few issues.~~Im not 100% sure this actually works.~~ Lets wait forsymfony/symfony#32139Im sure nowCommits-------9fbebaf [Cache] Make sure the chain cache configuration works

…y providing several adapters (nicolas-grekas)This PR was merged into the 4.4 branch.Discussion----------[FrameworkBundle] Allow creating chained cache pools by providing several adapters| Q             | A| ------------- | ---| Branch?       | 4.4| Bug fix?      | no| New feature?  | yes| BC breaks?    | no| Deprecations? | no| Tests pass?   | yes| Fixed tickets | -| License       | MIT| Doc PR        | -Replaces#30984, followssymfony/symfony-docs#11813This PR allows defining several adapters for one pool. When doing so, this defines a chain pool.The benefit is that all chained pools get automatic namespace and lifetime, so things are transparent:```yamlpools:    my_chained_pool:        default_lifetime: 12        adapters:          - cache.adapter.array          - cache.adapter.filesystem          - {name: cache.adapter.redis, provider: 'redis://foo'}```(see fixtures for example of PHP/XML config)/cc@Nyholm@pborreli FYICommits-------29ba091 [FrameworkBundle] Allow creating chained cache pools by providing several adapters