gk_deploy: add --show-all switch to kubectl call

[crunis]

Inside gk_deploy script, in check() function definition, when calling kubectl to check if one of the jobs has finished, the call is missing "--show-all" so it also shows jobs that are in Completed status, otherwise if the job has finished it is not listed and the script keeps waiting, eventually timing out.

Sample output:

$ kubectl get pods --no-headers -l job-name=heketi-storage-copy-job
No resources found, use --show-all to see completed objects.
$ kubectl get pods --show-all --no-headers -l job-name=heketi-storage-copy-job
heketi-storage-copy-job-8nfz7   0/1       Completed   0         19m

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This change is 

[centos-ci]

Can one of the admins verify this patch?

[nixpanic]

ok to test

[obnoxxx]

This undoes half of PR #502 ...

@SaravanaStorageNetwork @jarrpa what to do here?

[obnoxxx]

Just want to see whether the @centos-ci had not run when triggered by @nixpanic or if it just does not show up in the list of checks:

ok to test

[bjwschaap]

Please note that --show-all shouldn't be used anymore, since it is deprecated. The default behaviour of kubectl in current version is equivalent to the previous show all. See: https://github.com/kubernetes/kubernetes/issues/67895