tests: shell: Improve performance of 0021prio_0

This test called nft binary 391 times and took about 38s to complete on
my testing VM. Improve this by writing all commands into a temporary
file for processing in a single nft call. Reduces run-time to about 4s.

Interestingly, piping the sub-process's output directly into 'nft -f -'
leads to spurious errors (parser complaining about perfectly fine
syntax). It seems like handling large input this way is not possible.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>

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