Update dependencies before adding support for Scaleway

[Mia-Cross]

Before we can add support for Scaleway in etcd-manager (#336), we first need to update the modules, particularly kops, so that we can incorporate the changes made in this PR in the vendor directory.
The update resulted in an error with the mount.Interface so a few changes were necessary in etcd-manager/pkg/hostmount/nsenter.go

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[olemarkus]

/ok-to-test

[remyleone]

/lgtm

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[olemarkus]

/lgtm

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