e2e: node: inline getSampleDevicePluginPod
e2e: node: inline getSampleDevicePluginPod

Starting golangci-lint >= 1.45, the tool is complaining
about the function being unused:
```bash
test/e2e_node/device_plugin_test.go:82:6: func `getSampleDevicePluginPod` is unused (unused)
func getSampleDevicePluginPod() *v1.Pod {
     ^

Please review the above warnings. You can test via "./hack/verify-golangci-lint.sh"
If the above warnings do not make sense, you can exempt this warning with a comment
 (if your reviewer is okay with it).
In general please prefer to fix the error, we have already disabled specific lints
 that the project chooses to ignore.
See: https://golangci-lint.run/usage/false-positives/}
```

thing is the code is not changed lately, and manual inspection trivially
confirms it is used.
Older versions of golangci-lint (tested with
```
golangci-lint has version 1.41.1 built from a2074809 on 2021-06-19T16:01:50Z
```)
indeed do NOT complain about the function, so this seems a golangci-lint
bug.

To move forward, we can disable the warning, but this leaves a sour
taste.
Instead, since the function is pretty trivias, was used just once and the caller
was undoing some of the work done by the function, we just inline it,
which solves the linter warning and makes the code a bit better.

Signed-off-by: Francesco Romani <c7100b580e6017ef67482ace46578cdd2d2e0dfe@redhat.com>

ravilr/kubernetes,ravilr/kubernetes,warmchang/kubernetes,kubernetes/kubernetes,rnaveiras/kubernetes,cblecker/kubernetes,dixudx/kubernetes,feiskyer/kubernetes,MikeSpreitzer/kubernetes,thockin/kubernetes,jsafrane/kubernetes,verb/kubernetes,liggitt/kubernetes,ping035627/kubernetes,zhangmingld/kubernetes,ii/kubernetes,olivierlemasle/kubernetes,k82cn/kubernetes,soltysh/kubernetes,jessfraz/kubernetes,chestack/kubernetes,dims/kubernetes,mahak/kubernetes,alejandroEsc/kubernetes,ravilr/kubernetes,alejandroEsc/kubernetes,warmchang/kubernetes,thockin/kubernetes,GulajavaMinistudio/kubernetes,liggitt/kubernetes,gnufied/kubernetes,BenTheElder/kubernetes,PiotrProkop/kubernetes,lojies/kubernetes,iameli/kubernetes,BenTheElder/kubernetes,soltysh/kubernetes,mkumatag/kubernetes,aledbf/kubernetes,shyamjvs/kubernetes,li-ang/kubernetes,jsafrane/kubernetes,kevin-wangzefeng/kubernetes,MikeSpreitzer/kubernetes,kubernetes/kubernetes,jessfraz/kubernetes,deads2k/kubernetes,gnufied/kubernetes,ping035627/kubernetes,feiskyer/kubernetes,dixudx/kubernetes,dixudx/kubernetes,rnaveiras/kubernetes,zhouhaibing089/kubernetes,olivierlemasle/kubernetes,soltysh/kubernetes,matthyx/kubernetes,zhangmingld/kubernetes,bparees/kubernetes,mosoft521/kubernetes,chestack/kubernetes,gnufied/kubernetes,carlory/kubernetes,mkumatag/kubernetes,tengqm/kubernetes,jessfraz/kubernetes,openshift/kubernetes,carlory/kubernetes,aledbf/kubernetes,openshift/kubernetes,feiskyer/kubernetes,soltysh/kubernetes,dims/kubernetes,rrati/kubernetes,jackfrancis/kubernetes,olivierlemasle/kubernetes,rnaveiras/kubernetes,csrwng/kubernetes,dims/kubernetes,openshift/kubernetes,rrati/kubernetes,feiskyer/kubernetes,openshift/kubernetes,ii/kubernetes,mengqiy/kubernetes,k82cn/kubernetes,olivierlemasle/kubernetes,tengqm/kubernetes,cblecker/kubernetes,feiskyer/kubernetes,bparees/kubernetes,lojies/kubernetes,gnufied/kubernetes,zhangmingld/kubernetes,iameli/kubernetes,kubernetes/kubernetes,bparees/kubernetes,jingxu97/kubernetes,enj/kubernetes,kevin-wangzefeng/kubernetes,liggitt/kubernetes,thockin/kubernetes,BenTheElder/kubernetes,iameli/kubernetes,li-ang/kubernetes,GulajavaMinistudio/kubernetes,ping035627/kubernetes,jingxu97/kubernetes,matthyx/kubernetes,k82cn/kubernetes,mkumatag/kubernetes,carlory/kubernetes,kevin-wangzefeng/kubernetes,kevin-wangzefeng/kubernetes,zhangmingld/kubernetes,shyamjvs/kubernetes,alejandroEsc/kubernetes,tengqm/kubernetes,warmchang/kubernetes,li-ang/kubernetes,jsafrane/kubernetes,mosoft521/kubernetes,rrati/kubernetes,PiotrProkop/kubernetes,shyamjvs/kubernetes,enj/kubernetes,dims/kubernetes,mengqiy/kubernetes,MikeSpreitzer/kubernetes,kubernetes/kubernetes,deads2k/kubernetes,lojies/kubernetes,li-ang/kubernetes,alejandroEsc/kubernetes,rrati/kubernetes,dims/kubernetes,csrwng/kubernetes,zhangmingld/kubernetes,deads2k/kubernetes,zhouhaibing089/kubernetes,bparees/kubernetes,thockin/kubernetes,chestack/kubernetes,PiotrProkop/kubernetes,olivierlemasle/kubernetes,verb/kubernetes,csrwng/kubernetes,lojies/kubernetes,cblecker/kubernetes,kevin-wangzefeng/kubernetes,cblecker/kubernetes,mahak/kubernetes,lojies/kubernetes,zhouhaibing089/kubernetes,BenTheElder/kubernetes,iameli/kubernetes,mengqiy/kubernetes,csrwng/kubernetes,PiotrProkop/kubernetes,rnaveiras/kubernetes,jingxu97/kubernetes,jessfraz/kubernetes,jackfrancis/kubernetes,ii/kubernetes,aledbf/kubernetes,jsafrane/kubernetes,mkumatag/kubernetes,verb/kubernetes,verb/kubernetes,dixudx/kubernetes,mosoft521/kubernetes,jackfrancis/kubernetes,mosoft521/kubernetes,matthyx/kubernetes,jackfrancis/kubernetes,matthyx/kubernetes,mkumatag/kubernetes,enj/kubernetes,rrati/kubernetes,warmchang/kubernetes,GulajavaMinistudio/kubernetes,ping035627/kubernetes,jackfrancis/kubernetes,warmchang/kubernetes,dixudx/kubernetes,kubernetes/kubernetes,shyamjvs/kubernetes,openshift/kubernetes,enj/kubernetes,GulajavaMinistudio/kubernetes,matthyx/kubernetes,jingxu97/kubernetes,mahak/kubernetes,thockin/kubernetes,tengqm/kubernetes,carlory/kubernetes,MikeSpreitzer/kubernetes,chestack/kubernetes,ping035627/kubernetes,mengqiy/kubernetes,iameli/kubernetes,verb/kubernetes,rnaveiras/kubernetes,mahak/kubernetes,ii/kubernetes,carlory/kubernetes,MikeSpreitzer/kubernetes,soltysh/kubernetes,zhangmingld/kubernetes,liggitt/kubernetes,zhouhaibing089/kubernetes,aledbf/kubernetes,deads2k/kubernetes,enj/kubernetes,alejandroEsc/kubernetes,mahak/kubernetes,cblecker/kubernetes,aledbf/kubernetes,BenTheElder/kubernetes,ravilr/kubernetes,k82cn/kubernetes,li-ang/kubernetes,chestack/kubernetes,mengqiy/kubernetes,mosoft521/kubernetes,PiotrProkop/kubernetes,jsafrane/kubernetes,zhouhaibing089/kubernetes,GulajavaMinistudio/kubernetes,deads2k/kubernetes,tengqm/kubernetes,csrwng/kubernetes,bparees/kubernetes,jingxu97/kubernetes,liggitt/kubernetes,ravilr/kubernetes,ii/kubernetes,jessfraz/kubernetes,shyamjvs/kubernetes,gnufied/kubernetes,k82cn/kubernetes