backup retention in B&R scheduled backups

[rajujith]

ISSUE TYPE

• Improvement Request

COMPONENT NAME

B&R

CLOUDSTACK VERSION

4.19

CONFIGURATION

OS / ENVIRONMENT

SUMMARY

CloudStack B&R scheduled backups do not have a 'keep' option to limit the copies of the scheduled backups to be retained. Its good to have it.

[rajujith]

This improvement may apply only to the NAS backup plugin. For Veeam and NetWorker, this property seems to be applied to the policies created on them. CC @Pearl1594

[abh1sar]

This is fixed by #10017