[etcd-druid]

Improvements

[OPERATOR] Removed .status.lastError after successful reconciliation (#33, @georgekuruvillak)
- Fixed the labels/selector issue in the statefulset manifest
- Introduced .status.observedGeneration
- Added logic to only reconcile if gardener.cloud/operation=reconcile and oldMeta.generation != newMeta.generation or .status.LastError != nil
[OPERATOR] Fix wget in etcd bootstrap script. (#32, @shreyas-s-rao)
[OPERATOR] Updates VERSION back to v0.2.0-dev. It was change with the hotfix merge. (#29, @georgekuruvillak)
[OPERATOR] Fixed the issue related to concurrent reconcilation of etcd resources messing up configmap, service and statefulset values. (#28, @georgekuruvillak)
[OPERATOR] Fix finalizer check in secret during deletion. (#27, @georgekuruvillak)