Bump cni plugins to v1.9.1 #2978

Job	Run time
build-windows / Build	7m 48s
build / Build	7m 59s
Integration Tests (windows)	1m 57s
Integration Tests (startup)	12m 31s
Integration Tests (etcdrestore)	4m 12s
Integration Tests (longhorn)	5m 30s
Integration Tests (kubeflags)	8m 56s
Integration Tests (etcdsnapshot)	9m 58s
Integration Tests (secretsencryption)	4m 50s
Integration Tests (flannelnone)	4m 4s
Integration Tests (localstorage)	3m 52s
Integration Tests (custometcdargs)	3m 22s
Integration Tests (cacertrotation)	5m 4s
Integration Tests (certrotation)	5m 0s
	1h 25m 3s

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