tests: adapt test suite to run with legacy+nftables based binaries

While at it, make following changes/fixes:
 1. run each test in a fresh net namespace
 2. remove rmmod use, its very distuptive and not needed after 1.
 3. avoid -e use if possible
 4. make sure we exit 0 when test is expected to fail
 5. set XT_LIBDIR so we point at the correct extensions to be used

Also delete 0003duplicate_1, its same test as 0001duplicate_1.

NB: I don't think its good to have this 'encode retval in name' scheme.

These are scripts, so they should always return 0, i.e. do

  iptables --this-command-should-fail || exit 0
  echo "succeess, should fail"
  exit 1

Much simpler, imo.  This was inherited from nft shell tests
though and changing it there is rather intrusive so use same scheme for
now.

Signed-off-by: Florian Westphal <fw@strlen.de>

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