Remove (some) bashisms from the test scripts

[Björn JACKE]

On 2017-12-27 at 07:36 +0200 Uri Simchoni via samba-technical sent off:
> > But what is wrong with the ldbsearch one? It's obviously a bug in the
> > script and that exposes clearly, if you compile with external t* libs.
> > 
> > With regards,
> > Timur Bakeyev.
> > 
> 
> Nothing is wrong IMHO but it requires two reviewers. Please bear with us :)

+1 from me

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