kubectl: small internal to external type fix

[seans3]

• Small fix to change from internal type to external type in qos.go
• Small fix to update import alias to corev1 in resource.go

Helps fix:
kubernetes/kubectl#80

NONE

/kind cleanup
/priority important-soon
/sig cli
/area kubectl
/assign

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: seans3

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[yue9944882]

/lgtm
/retest

[adohe-zz]

/milestone v1.13

[yue9944882]

/test pull-kubernetes-e2e-gce-device-plugin-gpu

[fejta-bot]

/retest
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[seans3]

/retest

[k8s-ci-robot]

@seans3: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-kubernetes-kubemark-e2e-gce-big	6a57de3	link	/test pull-kubernetes-kubemark-e2e-gce-big

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