tests/shell: export NFT_TEST_RANDOM_SEED variable for tests

Let "run-tests.sh" export a NFT_TEST_RANDOM_SEED variable, set to
a decimal, random integer (in the range of 0 to 0x7FFFFFFF).

The purpose is to provide a seed to tests for randomization.
Randomizing tests is very useful to increase the coverage while not
testing all combinations (which might not be practical).

The point of NFT_TEST_RANDOM_SEED is that the user can set the
environment variable so that the same series of random events is used.
That is useful for reproducing an issue, that is known to happen with a
certain seed.

- by default, if the user leaves NFT_TEST_RANDOM_SEED unset or empty,
  the script generates a number using $SRANDOM.
- if the user sets NFT_TEST_RANDOM_SEED to an integer it is taken
  as is (modulo 0x80000000).
- otherwise, calculate a number by hashing the value of
  $NFT_TEST_RANDOM_SEED.

Signed-off-by: Thomas Haller <thaller@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>

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