Build

Release 21.2.0 #4865

# to view logs

Job	Run time
build	11m 58s
lighty_rnc_app_test / build	6m 57s
lighty_rcgnmi_app_test / build	6m 10s
lighty_rnc_cluster_app_test / build	8m 27s
	33m 32s

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