Remove (some) bashisms from the test scripts

[Timur I. Bakeyev]

Yet another fixes to make self-test work out of the box on FreeBSD.

Despite having '#!/bin/sh' in the test shell scripts there are some
bashisms present,
that make FreeBSD sh croak.

I've run Debian's 'checkbashisms' script against test scripts and tried to
address most of it's (reasonable) warnings.

Also, one failing test spotted the place where direct call to the
'ldbsearch' wasn't replaced with the configurable path.

With best regards,
Timur Bakeyev.
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