*Fix graceful shutdown notify failure #277

Job	Run time
set-execution-conditions	9s
build agent and cache	3m 55s
download midwares and cache	15s
Test for spring (1.5.0.RELEASE, Edgware.SR2, 1.5.0.RELEASE)	3m 38s
Test for spring (2.0.2.RELEASE, Finchley.RELEASE, 4.1.3, 2.0.0.RELEASE, 1.0.1)	3m 58s
Test for spring (2.1.0.RELEASE, Greenwich.RELEASE, 4.2.6, 2.1.0.RELEASE, 1.0.1)	3m 40s
Test for spring (2.2.0.RELEASE, Hoxton.RELEASE, 4.3.6, 2.2.0.RELEASE, 1.0.3)	3m 44s
Test for spring (2.3.0.RELEASE, Hoxton.RELEASE, 4.4.1, 2.2.8.RELEASE, 1.1.2)	3m 31s
Test for spring (2.4.0, 2020.0.0, 4.5.6, 2021.0.1.0, 1.1.4)	3m 44s
Test for spring (2.6.2, 2021.0.0, 4.5.10, 2021.1, 1.1.10)	3m 25s
Test for spring (2.7.2, 2021.0.3, 4.5.13, 1.1.12)	3m 46s
	33m 45s

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