[Console] filter doctrine log with -vv cli option
feature #707 [Console] filter doctrine log with -vv cli option (lyrixx)

This PR was merged into the 2.6-dev branch.

Discussion
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[Console] filter doctrine log with -vv cli option

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | none
| License       | MIT
| Doc PR        | none

I add this configuration to all my projects. So I think it could be the default
behavior fore everyone.

Why?

When you write commands and you use lot of log in your application with the
`debug` log level; you have to use `-vvv` option to see them. But with
`-vvv``option, doctrine log is also output. This is a bit annoying because it
becomes very hard to filter your log from doctrine log.

How?

So with this patch you get all logs with `debug` or higher log level, except
doctrine log with `vv` option. And you get all logs with `-vvv` option. With
only `-v` option, you get only `info` or higher log level.

Commits
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138065d [Console] filter doctrine log with -vv cli option