Unlink existing CNI bin symlinks #375

Job	Run time
build / Build	6m 44s
Docker Tests (basics)	1m 12s
Docker Tests (bootstraptoken)	1m 2s
E2E Tests (startup)	8m 48s
Docker Tests (cacerts)	53s
E2E Tests (s3)	8m 43s
Docker Tests (compat)	2m 21s
E2E Tests (btrfs)	4m 33s
Docker Tests (lazypull)	59s
E2E Tests (externalip)	6m 1s
Docker Tests (upgrade)	2m 25s
E2E Tests (privateregistry)	7m 26s
E2E Tests (embeddedmirror)	6m 27s
E2E Tests (wasm)	4m 59s
	1h 2m 33s

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