Lubomir I. Ivanov 505413581e kubeadm: handle stable-1 as the default version ...

The default version in kubeadm is now `stable-1`. This will
pull a version from the `stable-1.txt` endpoint which might
end up being newer than the version of the client by a magnitude
of MINOR or even a MAJOR release.

To be able to prevent this scenario add the new helper function:
validateStableVersion()

This function determines if the remote version is newer than the
local client version and if that's the case it returns `stable-X.xx`
that conforms with the version of the client. If not it returns
the remote version.

2018-10-05 00:02:57 +03:00

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