s3-param Remove special case for lp_workgroup()

[Stefan (metze) Metzmacher]

Hi Andrew,

commit 3ccc7609476139bc6a906110a2623605f3802159 introduced a regression
in rpcclient, which makes it unusable, as the lp_workgroup() returns
uninitialized memory.

I have put a fix for this into autobuild, but it would be nice if you could
add some blackbox tests for rpcclient, so that we'll detect things like
this in future.

Thanks!
metze

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