Optimize the performance of xds flow control functionality #2323

Job	Run time
build agent and cache	1m 37s
download midwares and cache	6s
set-execution-conditions	13s
Test for spring (1.5.0.RELEASE, Edgware.SR2, 1.5.0.RELEASE)	2m 8s
Test for spring (2.0.2.RELEASE, Finchley.RELEASE, 4.1.3, 2.0.0.RELEASE, 1.0.1)	2m 30s
Test for spring (2.1.0.RELEASE, Greenwich.RELEASE, 4.2.6, 2.1.0.RELEASE, 1.0.1)	2m 30s
Test for spring (2.2.0.RELEASE, Hoxton.RELEASE, 4.3.6, 2.2.0.RELEASE, 1.0.3)	2m 4s
Test for spring (2.3.0.RELEASE, Hoxton.RELEASE, 4.4.1, 2.2.8.RELEASE, 1.1.2)	2m 11s
Test for spring (2.4.0, 2020.0.0, 4.5.6, 2021.0.1.0, 1.1.4)	2m 2s
Test for spring (2.6.2, 2021.0.0, 4.5.10, 2021.1, 1.1.10)	2m 0s
Test for spring (2.7.2, 2021.0.3, 4.5.13, 1.1.12)	2m 20s
	19m 41s

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