[PROFILER][REDIS] Support database, auth on redis connection
merged branch stephpy/redis_profiler (PR #6680)

This PR was merged into the master branch.

Commits
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d027f45 [PROFILER][REDIS] Support database, auth on redis connection

Discussion
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[PROFILER][REDIS] Support database, auth on redis connection

Bug fix: no
Feature addition: yes
Backwards compatibility break: no
Symfony2 tests pass: yes

Allow database and password on dsn:

```yml
framework:
    profiler:
        dsn: redis://127.0.0.1:6379
        dsn: redis://127.0.0.1:6379/3
        dsn: redis://user:password@127.0.0.1:6379/3
```

Since redis uses only password for authentification, user will not be used ...

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by shouze at 2013-01-10T16:58:02Z

:+1: db selection is a must have