dep: bump k8s to 1.12.6 and regenerate codegen (#2059)

* bump k8s to 1.12.6 and golang to 1.11.5
* pkg/generated: regenerate codegen
* resolve k8s breaking changes

Signed-off-by: Sam Batschelet <sbatsche@redhat.com>

Author: hexfusion

CHANGELOG.md

@@ -7,6 +7,8 @@
 
 ### Changed
 
+- Update Go version to 1.11.5
+- Update k8s to 1.12.6
 - EtcdBackup: Support periodically backup. This change added 3 new fileds in EtcdBackup schema, 2 variables is in spec, 1 varialbe is in status.
   - in spec.backupPolicy
     - maxBackup which indicate maximum number of backup to keep