Bump kine to v0.15.0 #3023

Job	Run time
build-windows / Build	7m 14s
build / Build	7m 49s
Integration Tests (windows)	1m 37s
Integration Tests (custometcdargs)	3m 30s
Integration Tests (etcdrestore)	4m 32s
Integration Tests (certrotation)	3m 38s
Integration Tests (cacertrotation)	4m 41s
Integration Tests (longhorn)	5m 38s
Integration Tests (startup)	12m 10s
Integration Tests (kubeflags)	9m 49s
Integration Tests (localstorage)	4m 6s
Integration Tests (etcdsnapshot)	9m 49s
Integration Tests (flannelnone)	3m 44s
Integration Tests (secretsencryption)	4m 56s
	1h 23m 13s

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