Set severity level for VIP_Request_Block messages.

[emrikol]

Expected/Desired Behavior

I think it would be nice if we switched the VIP_Request_Block class from using error_log() to trigger_error( $message, E_USER_NOTICE ) so that request blocking messages could be easily filtered out of the error logs.

Actual Behavior

We currently just ship out the message without a severity, making filtering harder to do when sorting through many messages.

[rinatkhaziev]

PRs welcome. I think it should be E_USER_WARNING though?

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