Jun Gong

Fix issue #973

**Is your feature request related to a problem? Please describe.** Tapp status is too large when its replicas is large. We'd like to make it small. **Describe the solution you'd...

Add support for more update strategy: - [x] https://github.com/tkestack/tapp/pull/36: Add suport for specifying percentage of pods for RollingUpdate

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Add some metrics for controller, e.g. number_of_created_pods_per_second

Update k8s client version to latest stable version, and re-generate the tapp client.

> The custom controller needs the right set of permissions, expressed through a set of role-based access control (RBAC)–related settings.