Automatic merge from submit-queue (batch tested with PRs 38252, 41122, 36101, 41017, 41264)

Fix cluster-cidr flag

**What this PR does / why we need it**:
Fixes the kube-proxy daemonset config when using the `pod-network-cidr flag`. The return value of `getClusterCIDR` should be prefixed with a `-`.

**Special notes for your reviewer**:
None

@luxas