Improved console logging for webspace init

- Added method to override logger for webspace init
- Output portal errors to console

I created a portal XML file, but it was not being registered by the `sulu:webspaces:init` command. It turns out that the XML did not fit the schema and it was being ignored, and a message was being logged in the log file.

This PR redirects the logging to the console .. but I wonder if it wouldn't be better to simply throw the Exception? What good is an invalid webspace XML file?