Improve methods that creates user-data and meta-data by using go template instead of string replace

[fabulous-gopher]

From @SandeepPissay on March 22, 2017 21:33

See comment https://github.com/vmware/kops/pull/4/files/e91b80849c048af0e2ba32c289712fd8b8d09c02#diff-debc963c3e706d2e00f5524af9b78675

Copied from original issue: vmware-archive#5

[fabulous-gopher]

From @prashima on April 21, 2017 22:37

Upstream PR is already out. Moving this to M1, raising priority for early resolution.

[fabulous-gopher]

From @pdhamdhere on April 28, 2017 17:53

@casualjim This could be good one to get started and familiar with KOPS. Please re-assign as appropriate.

[chrislovecnm]

/area vsphere

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