tests/py: Review print statements in nft-test.py

Make use of format strings as they are easier to read than manual string
concatenation.

Also use class Table's __str__ method instead of printing the 'name'
attribute. This changes the output in that table names are prepended by
their family, but the extra information may come in handy when analyzing
issues.

Since class Chain's __str__ method returns just the 'name' attribute
content, it may be used as synonym.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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