Add exclusions to WAF cmdlets

[digavino]

Description

Adding Exclusion parameter to WAF cmdlets.

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate ChangeLog.md file(s) has been updated:
  • For any service, the ChangeLog.md file can be found at src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md
  • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header -- no new version header should be added
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • a cmdlet design review was approved for the changes in this repository (Microsoft internal only)
  • the markdown help files have been regenerated using the commands listed here

[isra-fel]

Hi @digavino readme.md needs to be updated

[isra-fel]

@digavino please change the PR's title and description properly. You are doing much more than just upgrading SDK version.

And also make sure to read and check the checklist please.

Thanks

[digavino]

Hi, now the code review is ready (no unrelated changes). Thanks @isra-fel