Change print statement syntax and subprocess calls as well as some list comprehension syntax. Change-Id: Iebdea5f06be963e7f04af4df352aacef9b31a8eb Signed-off-by: Seth Howell <seth.howell@intel.com> Reviewed-on: https://review.gerrithub.io/410957 Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com> Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>