A fair bit of setup / teardown code was being duplicated in many
test cases in the socketpair testsuite.
Take advantage of the `setup()`, `before()`, and `after()`
functions in the new ZTest API.
Signed-off-by: Christopher Friedt <cfriedt@meta.com>
Wow, this testsuite was really celebrating some redundancy
before.
While that is sometimes a good thing, it's also sometimes
better to be more concise.
Signed-off-by: Chris Friedt <cfriedt@meta.com>
