log: make sure generators never log into the journal to avoid activation deadlocks

This makes all generators log to kmsg by default.

src/cryptsetup/cryptsetup-generator.c

@@ -249,7 +249,7 @@ int main(int argc, char *argv[]) {
         if (argc > 1)
                 arg_dest = argv[1];
 
-        log_set_target(LOG_TARGET_AUTO);
+        log_set_target(LOG_TARGET_SAFE);
         log_parse_environment();
         log_open();