Fix some bugs in xds flow control #2314

Job	Run time
build agent and cache	2m 16s
build agent and cache	2m 16s
download midwares and cache	7s
download midwares and cache	7s
set-execution-conditions	12s
set-execution-conditions	12s
Test for spring (1.5.0.RELEASE, Edgware.SR2, 1.5.0.RELEASE)	12s
Test for spring (1.5.0.RELEASE, Edgware.SR2, 1.5.0.RELEASE)	15m 6s
Test for spring (2.0.2.RELEASE, Finchley.RELEASE, 4.1.3, 2.0.0.RELEASE, 1.0.1)	7s
Test for spring (2.0.2.RELEASE, Finchley.RELEASE, 4.1.3, 2.0.0.RELEASE, 1.0.1)	15m 34s
Test for spring (2.1.0.RELEASE, Greenwich.RELEASE, 4.2.6, 2.1.0.RELEASE, 1.0.1)	9s
Test for spring (2.1.0.RELEASE, Greenwich.RELEASE, 4.2.6, 2.1.0.RELEASE, 1.0.1)	15m 2s
Test for spring (2.2.0.RELEASE, Hoxton.RELEASE, 4.3.6, 2.2.0.RELEASE, 1.0.3)	8s
Test for spring (2.2.0.RELEASE, Hoxton.RELEASE, 4.3.6, 2.2.0.RELEASE, 1.0.3)	14m 42s
Test for spring (2.3.0.RELEASE, Hoxton.RELEASE, 4.4.1, 2.2.8.RELEASE, 1.1.2)	7s
Test for spring (2.3.0.RELEASE, Hoxton.RELEASE, 4.4.1, 2.2.8.RELEASE, 1.1.2)	15m 13s
Test for spring (2.4.0, 2020.0.0, 4.5.6, 2021.0.1.0, 1.1.4)	8s
Test for spring (2.4.0, 2020.0.0, 4.5.6, 2021.0.1.0, 1.1.4)	14m 57s
Test for spring (2.6.2, 2021.0.0, 4.5.10, 2021.1, 1.1.10)	8s
Test for spring (2.6.2, 2021.0.0, 4.5.10, 2021.1, 1.1.10)	14m 41s
Test for spring (2.7.2, 2021.0.3, 4.5.13, 1.1.12)	7s
Test for spring (2.7.2, 2021.0.3, 4.5.13, 1.1.12)	14m 5s
	2h 5m 36s

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