Avoid logging non-fatal messages without logging system initialization.

Avoid logging non-fatal messages without logging system initialization.

Logs that come before logging system intialization spam the
console output. Therefore, we make the logging a no-op for
non-fatal messages until logging system has been initialized.
Usually, we initialize the logging system when process starts up,
so we will swallow only those non-fatal log messages that are
generated during very early stages of process initialization.

Signed-off-by: Dmitry Torokhov <dtor@vmware.com>