tests: py: allow to run tests with other nft binaries

Allow to run tests with other nft binaries by reading a 'NFT'
environment variable, allowing arbitrary locations for the nft binary.

This is what the tests/shell/run-tests.sh script does.

Among other thing, this allow us to properly hook this testsuite
from the Debian CI environment (https://ci.debian.net) where we can perform
tests for packages 'as installed'.

Examples:

 # run with default config (ie src/nft)
 % ./nft-test.py

 # run with installed binary (ie /usr/sbin/nft)
 % NFT=/usr/sbin/nft ./nft-test.py

Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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