generators: introduce a common implementation for the log setup boilerplate

src/cryptsetup/cryptsetup-generator.c

@@ -583,10 +583,7 @@ int main(int argc, char *argv[]) {
         if (argc > 1)
                 arg_dest = argv[1];
 
-        log_set_prohibit_ipc(true);
-        log_set_target(LOG_TARGET_AUTO);
-        log_parse_environment();
-        log_open();
+        log_setup_generator();
 
         umask(0022);