Proxy: Remove dependency of godotenv. #4158 #3597

Job	Run time
utest-regression-blackbox-test	9m 25s
cygwin64-cache	1m 44s
multiple-arch-aarch64	22m 43s
multiple-arch-armv7	22m 20s
cygwin64	15m 12s
fast	1s
build-centos7	4m 56s
build-ubuntu16	3m 8s
build-cross-arm	5m 17s
build-cross-aarch64	5m 3s
build-ubuntu18	3m 8s
build-ubuntu20	3m 39s
coverage	3m 40s
multiple-arch-amd64	2m 25s
test-done	1s
	1h 42m 42s

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