logging: remove configuration remnants from old logging system

[marcusmueller]

I don't thin log4cpp ever reacted to log4j config strings, so this might have never done anything

Signed-off-by: Marcus Müller [email protected]

Description

Related Issue

Which blocks/areas does this affect?

Testing Done

Checklist

• I have read the CONTRIBUTING document.
• I have squashed my commits to have one significant change per commit.
• I have signed my commits before making this PR
• My code follows the code style of this project. See GREP1.md.
• I have updated the documentation where necessary.
• I have added tests to cover my changes, and all previous tests pass.

[argilo]

This change in particular has caused a bit of trouble, because GNU Radio prior to version 3.10 raises an exception when it encounters an unknown log level, and critical is not in the list:

gnuradio/gnuradio-runtime/lib/logger.cc

Lines 169 to 196 in fe1b359

	void logger_set_level(logger_ptr logger, const std::string& level)
	{
	std::string nocase = level;
	std::transform(level.begin(), level.end(), nocase.begin(), ::tolower);
	if (nocase == "off" || nocase == "notset")
	logger_set_level(logger, log4cpp::Priority::NOTSET);
	else if (nocase == "all" || nocase == "debug")
	logger_set_level(logger, log4cpp::Priority::DEBUG);
	else if (nocase == "info")
	logger_set_level(logger, log4cpp::Priority::INFO);
	else if (nocase == "notice")
	logger_set_level(logger, log4cpp::Priority::NOTICE);
	else if (nocase == "warn")
	logger_set_level(logger, log4cpp::Priority::WARN);
	else if (nocase == "error")
	logger_set_level(logger, log4cpp::Priority::ERROR);
	else if (nocase == "crit")
	logger_set_level(logger, log4cpp::Priority::CRIT);
	else if (nocase == "alert")
	logger_set_level(logger, log4cpp::Priority::ALERT);
	else if (nocase == "fatal")
	logger_set_level(logger, log4cpp::Priority::FATAL);
	else if (nocase == "emerg")
	logger_set_level(logger, log4cpp::Priority::EMERG);
	else
	throw std::runtime_error("logger_set_level: Bad level type.");
	}

Gqrx's AppImage releases are presently built on top of GNU Radio 3.8, and they fail to start if GNU Radio 3.10.7.0 or later is installed: gqrx-sdr/gqrx#1316

I'll probably resolve this by updating the AppImage to use GNU Radio 3.10, but I wanted to note the problem here in case other users with multiple GNU Radio versions run into the same problem.