Repurpose -a to mean --advanced_conf_file as --app_config is unused #5
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Currently the -a flag is not used. Originally introduced in [1],
it [seemingly] was meant to allow for app.config location customization.
That never materialized as the flag is not used anywhere in the codebase
besides the getopt definition.
Instead we repurpose -a to mean --advanced_conf_file, which was adopted
in a fork currently bundled with RabbitMQ. Having a hardcoded location
for advanced.config is primarily inconvenient in integration tests
that generate configuration files.
Note that --app_config has been removed. The version will be bumped to
2.3.0.
Per discussion with @dcorbacho @kjnilsson @lukebakken.