Restore default SELinux security contexts for container runtime binaries

[hakman]

With RPMs, SELinux security contexts are magically set for installed files.
In the case of the ones Kops extracts, those security contexts have to be set some other way. Easiest way is to do it during service start.

Note that, at the moment, SELinux support in Kops is limited to worker nodes.

[hakman]

I believe this is the reason why https://testgrid.k8s.io/sig-storage-kubernetes#kops-selinux is broken at the moment.
/cc @rifelpet @bertinatto

[hakman]

/milestone v1.19

[k8s-ci-robot]

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/milestone v1.19

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[k8s-ci-robot]

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[hakman]

/retest

[bertinatto]

/lgtm