Unlink existing CNI bin symlinks #2008

Job	Run time
build / Build	7m 30s
Integration Tests (certrotation)	2m 3s
Integration Tests (cacertrotation)	2m 12s
Integration Tests (etcdrestore)	2m 11s
Integration Tests (localstorage)	1m 51s
Integration Tests (startup)	7m 23s
Integration Tests (custometcdargs)	1m 18s
Integration Tests (etcdsnapshot)	9m 7s
Integration Tests (kubeflags)	7m 10s
Integration Tests (longhorn)	3m 20s
Integration Tests (secretsencryption)	2m 56s
Integration Tests (flannelnone)	1m 49s
	48m 50s

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