In RPC mode the log_level was always reset to the default log level of 2, if no
configuration file was used.

This saves the log level set via RPC in opts.log_level and a configuration file
can overwrite it later, but if it is only set via RPC this value is not ignored
now.
Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>