net: selftests: clean up tools/testing/selftests/net/lib/py/utils.py

This patch improves the utils.py module by removing unused imports
(errno, random), simplifying the fd_read_timeout() function by
eliminating unnecessary else clause, and cleaning up code style in the
defer class constructor.

Additionally, it renames the parameter in rand_port() from 'type' to
'stype' to avoid shadowing the built-in Python name 'type', improving
code clarity and preventing potential issues.

These changes enhance code readability and maintainability without
affecting functionality.

Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250901-fix-v1-1-df0abb67481e@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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