add tagsuffix to take image tag suffix

[DiptoChakrabarty]

Fix #4322

A new parameter tagSuffix has been added in the Image struct which considers the suffix to an existing tag , if present the suffix is appended to the current tag and image is updated.

Not sure if test is needed and if yes should it go on this file

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@DiptoChakrabarty: This PR has multiple commits, and the default merge method is: merge.
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[natasha41575]

Can we update these comments to explain the difference between digest and newTag? As it is, it sounds like they should do the exact same thing but that is not the case.

[natasha41575]

/ok-to-test

[natasha41575]

/lgtm

[natasha41575]

please fix the CI failure! https://github.com/kubernetes-sigs/kustomize/runs/4743248529?check_suite_focus=true

[natasha41575]

/lgtm
/approve

[DiptoChakrabarty]

just rebased it and tried fixing the yaml examples in tests

[DiptoChakrabarty]

hey @natasha41575 the test passed , there was an issue with spaces in the yaml tests

[natasha41575]

/lgtm

[natasha41575]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: DiptoChakrabarty, natasha41575

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[natasha41575]

/hold cancel

[DiptoChakrabarty]

@natasha41575 fixed the testcases

[natasha41575]

/lgtm