RedisProfilerStorage wrong db-number/index-number selected
merged branch trivago/webprofiler_redis_add_select (PR #7177)

This PR was squashed before being merged into the 2.1 branch (closes #7177).

Commits
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c82c754 RedisProfilerStorage wrong db-number/index-number selected

Discussion
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RedisProfilerStorage wrong db-number/index-number selected

bug: in the webprofiler the wrong database (0) is selected when storage should not go to index 0. on redis connect the default behaviour is to select index/database number 0, but it is necessary to select a special index/database.
see: http://rediscookbook.org/multiple_databases.html

[HttpKernel] [Profiler] [RedisProfilerStorage] added select for a db-number/db-index to dsn-patttern

| Q             | A
| ------------- | ---
| Bug fix?      | [yes]
| New feature?  | [no]
| BC breaks?    | [no]
| Deprecations? | [no]
| Tests pass?   | [yes]
| Fixed tickets |
| License       | MIT

Usage with index/db-number = 7 :
```xml
<!-- config_dev.xml -->

<symfony:profiler only-exceptions="false" dsn="redis://127.0.0.1:6379/7" lifetime="3600" />

```

```yml
#config_dev.yml

framework:
...
    profiler:
    ...
        dsn: redis://127.0.0.1:6379/7

```

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by fabpot at 2013-02-27T07:21:02Z

Can you also add some unit tests?

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by JohnDoe007 at 2013-02-27T09:36:28Z

@fabpot the function getRedis() is currently not testable, I think. this means I have to do a bigger change to the class, add a public function initRedis() or something and move initialize code there to make the initialization process, where my change is, testable. is this ok to do it in that bugfix/pull request? or should I add this test change to master and only adding this small bugfix to the 2.1-branch?

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by fabpot at 2013-03-06T16:47:37Z

Thanks, I've merged the fix. Can you work on the changes needed to allow the code to be testable (on the master branch)?