tests/shell: move valgrind wrapper script to separate script

Previously, in valgrind mode we would generate one script, which had
"$NFT" variable and the temp directory hard coded.

Soon, we will run jobs in parallel, so they would need at least
different temp directories. Also, we want to put the valgrind results
are inside "$NFT_TEST_TESTTMPDIR", along the test data.

Extract the wrapper script to a separate script. It does not need to be
generated ad-hoc, instead it uses the environment variables "$NFT_REAL" and
"$NFT_TEST_TESTTMPDIR", as "run-tests.sh" prepares them.

Also, add a "$NFT_REAL" variable for the actual NFT binary. We wrap the
"$NFT" variable with VALGRIND=y or the user may pass "NFT='valgrind
nft'". We should have access to the real binary. That might be useful
for example to call `ldd "$NFT_REAL" | grep libjansson` to check for
JSON support.

Also, we use libtool. So quite possible the nft binary is actually a
shell script. Calling valgrind on that script results in a lot of leak
reports from shell (and slows down the command). Instead, use `libtool
--mode=execute`.

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

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