set tags workers unlimitedly (#2801) #1530

Job	Run time
clang-compile-with-bazel	9m 25s
clang-compile-with-boringssl	10m 41s
clang-compile-with-bazel-all-options	10m 44s
clang-compile-with-cmake	2m 51s
clang-compile-with-cmake-all-options	5m 5s
clang-compile-with-make	2m 53s
clang-compile-with-make-all-options	5m 1s
clang-unittest	15m 53s
gcc-compile-with-bazel	10m 56s
gcc-compile-with-bazel-all-options	12m 58s
gcc-compile-with-boringssl	13m 9s
gcc-compile-with-cmake	3m 25s
gcc-compile-with-cmake-all-options	5m 43s
gcc-compile-with-make	2m 55s
gcc-compile-with-make-all-options	4m 46s
	1h 56m 25s

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