Kubectl version on beam executors must be upgraded to at least 1.9.3

Currently beam inventory jobs [https://builds.apache.org/view/A-D/view/Beam/job/beam_Inventory_beam1/57/console](https://builds.apache.org/view/A-D/view/Beam/job/beam_Inventory_beam1/57/console) shows that we are using:
**** kubectl version -c
Flag shorthand -c has been deprecated, please use \--client instead.
Client Version: version.Info{Major:"1", Minor:"9", GitVersion:"v1.9.0", GitCommit:"925c127ec6b946659ad0fd596fa959be43f0cc05", GitTreeState:"clean", BuildDate:"2017-12-15T21:07:38Z", GoVersion:"go1.9.2", Compiler:"gc", Platform:"linux/amd64"
This kubectl version is old and doesn't allow us to fully use [https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/](https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/) which will be used by complex large clusters like hdfs/hbase. 

Without this upgrade to at least 1.9.3 version we can expect this error:
[https://github.com/kubernetes/kubernetes/issues/59867

]Minor: can we also print server version in beam inventory job by running:
kubectl version
instead of just kubectl version -c ?? 

Imported from Jira [BEAM-4362](https://issues.apache.org/jira/browse/BEAM-4362). Original Jira may contain additional context.
Reported by: szewinho.