pkg/receipt: move under pkg/installation

[ahmetb]

Moving to somewhere more logically relevant.
Fixes #271.

/hold
since other in-flight PRs (or this PR) like #278 will require rebase (depending
on which one gets merged first).

[corneliusweig]

/hold cancel

[codecov-io]

Codecov Report

Merging #280 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #280   +/-   ##
=======================================
  Coverage   54.84%   54.84%           
=======================================
  Files          19       19           
  Lines         877      877           
=======================================
  Hits          481      481           
  Misses        342      342           
  Partials       54       54

Impacted Files	Coverage Δ
pkg/installation/receipt/receipt.go	75% <ø> (ø)
pkg/installation/util.go	41.37% <ø> (ø)	⬆️
pkg/installation/install.go	34.31% <ø> (ø)	⬆️
pkg/installation/upgrade.go	0% <ø> (ø)	⬆️

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[ahmetb]

ready to review

[corneliusweig]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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