migrate to using Lease for leader election

library-go should use Lease for leader election by default. 
In 4.10 we switched from configmaps to configmapsleases, now we can switch to leases

change library-go to use lease by default, we already have an open pr for that: https://github.com/openshift/library-go/pull/1448 

once the pr merges, we should revendor library-go for:
- kas operator
- oas operator
- etcd operator
- kcm operator
- openshift controller manager operator
- scheduler operator
- auth operator
- cluster policy controller

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