Ansible changes for Image Verification and GPG key installation

[aravindmani-1]

SUMMARY

Added the changes required for Image verification and gpg key installation

GitHub Issues

GitHub Issue #
N/A

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

• sonic_image_management

OUTPUT

regression-report-sonic-image-management.pdf

Checklist:

• I have performed a self-review of my own code to ensure there are no formatting, linting, or security issues
• I have verified that new and existing unit tests pass locally with my changes
• I have not allowed coverage numbers to degenerate
• I have maintained at least 90% code coverage
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have maintained backward compatibility or have provided any relevant "breaking_changes" descriptions in a "fragment" file in the "changelogs/fragments" directory of this repository.
• I have provided a summary for this PR in valid "fragment" file format in the "changelogs/fragments" directory of this repository branch. Reference : Ansible Change Log Document

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also list any relevant details for your test configuration

• Test A
• Test B

[stalabi1]

I know this PR is still in draft, but please make sure to add version_added to each new attribute

[aravindmani-1]

Done.