Internally, this was already used but it lacked a clean
public interface to set different log levels from the outside.
Useful for various command line tooling to implement verbosity
levels, e.g. -v, -vv, -vvv
log_error was using the log_writer_fatal impl which conflicts with
how this is used on AVS. Therefore, achieve a visible "error"
message in inject by using log_warning + ERROR string in the message
icex2