tests/utils: Fix pylint warnings
tests/utils: Fix pylint warnings

Signed-off-by: Alexandru-Cezar Sardan <490cf4494272cbda36b12d85d8b4db493ab05419@amazon.com>

firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker