Portable mktemp calls in the tests

[Timur I. Bakeyev]

Here is another piece of puzzle of making samba autobuild work out of the
box on FreeBSD.

There are plenty of places in the tests where 'mktemp` is called with
'--tempdir' or '-p' parameter, which are not recognized on FreeBSD(and,
possibly other Unix-like platforms).

This call can be safely replaced with the sequence:

$(TMPDIR="$TEST_VAR_DIR" mktemp -d)

Also, 'sha1sum' on FreeBSD is called just 'sha1', as well as there are
'md5' and 'sha256' commands instead of *sum variants.

So, second patch allows to set environment variable that would override
the name of the sha1sum command.

With regards,
Timur Bakeyev
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