CodeGen from PR 15708 in Azure/azure-rest-api-specs

Adding 2021-07-01 version in recoveryservices, recoveryservicessiterecovery folder to make it S360 compliant (#15708)

* Adding a new API version 2021-07-01 to make recoveryservices and recoveryservicessiterecovery RP same as recoveryservicesbackup

* Updating readme.md file

* Resolved PR comments

* Fixing Avocado failures

Co-authored-by: Madhumanti Dey <madhude@microsoft.com>

Author: SDKAuto