Only 3 of 13 Velero CRDs had short names (bsl, vsl, ssr). This adds
short names to the remaining 10 CRDs for better kubectl usability:
Backup=bkp, Restore=rst, Schedule=sched, BackupRepository=br,
DeleteBackupRequest=dbr, DownloadRequest=dr, PodVolumeBackup=pvb,
PodVolumeRestore=pvr, DataUpload=du, DataDownload=dd
Signed-off-by: Shubham Pampattiwar <spampatt@redhat.com>