MT#57982 Remove database.key_value.flavor config knob usage

We only support keydb now, and the config knob has been removed. Simply
hardcode the $server_name to keydb.

Change-Id: If00db36e4873404839ba685fb3f8f6cf1ac83e52

ngcp-cleanup-sems

@@ -10,9 +10,7 @@ my $service_restart = 1;
 lprint("=====================");
 lprint("script start");
 
-my $server_name = `ngcpcfg get database.key_value.flavor`;
-chomp($server_name);
-$server_name or die("dictionary server not found");
+my $server_name = 'keydb';
 
 # find bind IP from redis config file