logging: use non-fatal logging level for glib backend
In our usage of glib logging, every g_critical()/g_return*()/g_warning() is considered a bug. They must not occur in a regular program run, so that we can run NetworkManager with G_DEBUG=fatal-warnings. On the other hand, all nm_log() statements (even with severity <error>) are valid conditions that can occur at runtime. As a consequence, when nm-logging uses glib as backend, we must not use G_LOG_LEVEL_WARNING level. Otherwise $ /usr/sbin/NetworkManager --debug --g-fatal-warnings will dump core on the message "<warn> glib-version: cannot handle SIGUSR1 and SIGUSR2 signals. Consider upgrading glib to 2.36.0 or newer" Thereby, downgrade the glib level for "<info>" to G_LOG_LEVEL_INFO.
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