[Backup] fixed policy create with rgNamePrefix and rgNameSuffix

[hiaga]

Description

Fixed policy create with rgNamePrefix and rgNameSuffix. https://portal.microsofticm.com/imp/v3/incidents/details/233746722/home

Testing Guide

az backup policy create --name "TestingPolicy" --resource-group "MABRG02" --vault-name "vault410" --backup-management-type "AzureIaasVM" --policy "testpolicy.json"

History Notes

[Component Name 1] BREAKING CHANGE: az command a: Make some customer-facing breaking change.
[Component Name 2] az command b: Add some customer-facing feature.

---

This checklist is used to make sure that common guidelines for a pull request are followed.

• The PR title and description has followed the guideline in Submitting Pull Requests.

• I adhere to the Command Guidelines.

• I adhere to the Error Handling Guidelines.

[qwordy]

@hiaga Some checks were not successful

Results 
=========


ERROR: /home/vsts/work/1/s/src/azure-cli/azure/cli/command_modules/backup/custom.py:277:1: E302 expected 2 blank lines, found 1
/home/vsts/work/1/s/src/azure-cli/azure/cli/command_modules/backup/custom.py:281:1: W293 blank line contains whitespace
/home/vsts/work/1/s/src/azure-cli/azure/cli/command_modules/backup/custom.py:288:1: E302 expected 2 blank lines, found 1
/home/vsts/work/1/s/src/azure-cli/azure/cli/command_modules/backup/custom.py:277:1: E302 expected 2 blank lines, found 1
/home/vsts/work/1/s/src/azure-cli/azure/cli/command_modules/backup/custom.py:281:1: W293 blank line contains whitespace
/home/vsts/work/1/s/src/azure-cli/azure/cli/command_modules/backup/custom.py:288:1: E302 expected 2 blank lines, found 1
4     E302 expected 2 blank lines, found 1
2     W293 blank line contains whitespace

ERROR: Flake8: FAILED

ERROR: ************* Module azure.cli.command_modules.backup.custom
src/azure-cli/azure/cli/command_modules/backup/custom.py:281:0: C0303: Trailing whitespace (trailing-whitespace)
src/azure-cli/azure/cli/command_modules/backup/custom.py:281:0: C0303: Trailing whitespace (trailing-whitespace)

[hiaga]

@qwordy all checks have passed