Don't run any complex initialisation for the "version" lvm2 command.

We can use it even in read-only environment where a try to initialise
file-based locking fails (not to mention other processing related with
lvm2 init). Simply, we want to output the version only, nothing else.
And this should always work.

tools/lvmcmdline.c

@@ -1364,6 +1364,10 @@ int lvm2_main(int argc, char **argv)
 		unsetenv("LVM_DID_EXEC");
 	}
 
+	/* "version" command is simple enough so it doesn't need any complex init */
+	if (!alias && argc > 1 && !strcmp(argv[1], "version"))
+		return version(NULL, argc, argv);
+
 	if (!(cmd = init_lvm()))
 		return -1;