Fix Nacos reconnection failed continuously issue with message "com.alibaba.nacos.common.remote.exception.RemoteException: errCode: 500, errMsg: Unknown payload type:ServerCheckResponse" but actually the connection is already established. #2060

Job	Run time
download midwares and cache	9s
build agent and cache	1m 34s
set-execution-conditions	11s
Test for spring (1.5.0.RELEASE, Edgware.SR2, 1.5.0.RELEASE)	11m 26s
Test for spring (2.0.2.RELEASE, Finchley.RELEASE, 4.1.3, 2.0.0.RELEASE, 1.0.1)	11m 41s
Test for spring (2.1.0.RELEASE, Greenwich.RELEASE, 4.2.6, 2.1.0.RELEASE, 1.0.1)	11m 27s
Test for spring (2.2.0.RELEASE, Hoxton.RELEASE, 4.3.6, 2.2.0.RELEASE, 1.0.3)	11m 29s
Test for spring (2.3.0.RELEASE, Hoxton.RELEASE, 4.4.1, 2.2.8.RELEASE, 1.1.2)	11m 18s
Test for spring (2.4.0, 2020.0.0, 4.5.6, 2021.0.1.0, 1.1.4)	11m 6s
Test for spring (2.6.2, 2021.0.0, 4.5.10, 2021.1, 1.1.10)	11m 3s
Test for spring (2.7.2, 2021.0.3, 4.5.13, 1.1.12)	11m 14s
	1h 32m 38s

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