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Hello!

I've debugged this and discuss with @abh3. `ofs` only supports single stacking while we have a case we'd require multi-stack. Here is example when trying to load `throttle` plugin:

```
[root@hcc-marian ~]# grep -i "throttle" /var/log/xrootd/local-redirector/xrootd.log
...
=====> xrootd.fslib throttle default
Initializing a Throttled file system.
(Throttle Config)> throttle.throttle concurrency 20
```

It loads `throttle` just fine! However, when I put at the end of the xrootd config line e.g. "xrootd.fslib /usr/lib64/libXrdOfs.so" and restart I see only this:
```
[root@hcc-marian ~]# grep -i "throttle" /var/log/xrootd/local-redirector/xrootd.log
...
=====> xrootd.fslib throttle default
=====> xrootd.fslib throttle default
```

We also have use case in CMS where Multiuser support is required, i.e. `xrootd.fslib libXrdMultiuser.so default`, and `throttle` enabled at the same time. Long story short, xrootd.fslib directive overrides and only one option or the another (always latter one) can be used, an example:

*1) This loads multiuser and throttle default but not throttle concurrency (it's overridden):*
```
xrootd.fslib throttle default
throttle.throttle concurrency 20
multiuser.umask 0002
xrootd.fslib libXrdMultiuser.so default
```

*2) This loads throttle but doesn't multiuser:*
```
xrootd.fslib libXrdMultiuser.so default
multiuser.umask 0002
xrootd.fslib throttle default
throttle.throttle concurrency 20
```

Could you implement *multi-stack* support to address this problem?

Thanks,
Marian

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