Config: Improve env config to support multi values. v7.0.2 #3457

Job	Run time
multiple-arch-armv7	20m 37s
multiple-arch-aarch64	22m 47s
utest-regression-blackbox-test	9m 21s
cygwin64-cache	1m 45s
cygwin64	14m 55s
fast	1s
build-cross-aarch64	5m 10s
build-cross-arm	5m 20s
build-centos7	4m 49s
build-ubuntu16	3m 6s
build-ubuntu18	3m 9s
build-ubuntu20	3m 31s
coverage	3m 56s
multiple-arch-amd64	2m 22s
test-done	1s
	1h 40m 50s

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