scripts: improve quiet checkpatch
scripts: improve quiet checkpatch

The option --no-summary will remove this line in quiet mode:
	total: 1 errors, 0 warnings, 7 lines checked

Signed-off-by: Thomas Monjalon <ee2fa8b2681c737f775687e475dcbf2028a412f1@6wind.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk