Re-do: Configurable Roadrunner log level

[ejulen]

See #601. This adds a new flag, --log-level, to the octane:roadrunner command.

Was asked to provide an explanation as to why this broke; it was, simply put, due to an operator precedence issue added in the second commit.

'logs.level='.$this->option('log-level') ?: (app()->environment('local') ? 'debug' : 'warn')

Will result in logs.level= (no actual level) if no --log-level option is given instead of falling back to the old behaviour, due to . having higher precedence than ?:.

Adding parentheses fixes this:

'logs.level='.($this->option('log-level') ?: (app()->environment('local') ? 'debug' : 'warn'))

It's perhaps easiest to see with a simpler example:

'foo' . null ?: 'bar'

Results in foo, while

'foo' . (null ?: 'bar')

Results in foobar.