chore: standardize to {{- for go template expressions

[jackfrancis]

Reason for Change:

This is follow-on work to go template-related cloud-init data reduction. Standardizes the cloud-init specs to use {{- where appropriate to ensure that no unnecessary add'l newlines result.

Issue Fixed:

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

[codecov]

Codecov Report

Merging #3166 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3166   +/-   ##
=======================================
  Coverage   71.13%   71.13%           
=======================================
  Files         147      147           
  Lines       25670    25670           
=======================================
  Hits        18261    18261           
  Misses       6272     6272           
  Partials     1137     1137           

Impacted Files	Coverage Δ
pkg/engine/templates_generated.go	38.05% <ø> (ø)

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[mboersma]

/lgtm

[mboersma]

/lgtm

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jackfrancis, mboersma

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