Changes to support "ReplicasPerMaster" and "Instances"

[MECHANDR]

Description

• Added ReplicasPerMaster parameter in New-AzRedisCache cmdlet.
• Added ReplicasPerMaster and Instances in the output of Get-AzRedisCache cmdlet.

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

[VeryEarly]

Hi @MECHANDR ,

please also add "Prerelease = 'preview'" in Az.RedisCache.psd1

[MECHANDR]

Hi @MECHANDR ,
please also add "Prerelease = 'preview'" in Az.RedisCache.psd1

Added. Thanks.

[VeryEarly]

Hi @MECHANDR ,

TestZoneRedundancy.json failed at CredScan, looks like some response bodies contain passwords, ca you please take a look?