script/check-config.sh: fix SC2166 warnings
script/check-config.sh: fix SC2166 warnings

Like this one:

	In ./script/check-config.sh line 215:
	if [ "$kernelMajor" -lt 5 ] || [ "$kernelMajor" -eq 5 -a "$kernelMinor" -le 1 ]; then
							      ^-- SC2166 (warning): Prefer [ p ] && [ q ] as [ p -a q ] is not well defined.

Signed-off-by: Kir Kolyshkin <3a017b8ddb3f9cf3e4a59978b004111bdeb97f08@gmail.com>

opencontainers/runc,opencontainers/runc,opencontainers/runc,opencontainers/runc