Support Velero 1.4 (#981)

* Bump velero to 1.4 and it's plugin to 1.1.0

Signed-off-by: JenTing Hsiao <jenting.hsiao@suse.com>

* Better grammar

Signed-off-by: JenTing Hsiao <jenting.hsiao@suse.com>

* Address insensitive language and add self-signed certificate

Signed-off-by: JenTing Hsiao <jenting.hsiao@suse.com>

* Remove velero cilium CRDs known issue

Signed-off-by: JenTing Hsiao <jenting.hsiao@suse.com>

* Remove limitation on velero restoring version constraint

Signed-off-by: JenTing Hsiao <jenting.hsiao@suse.com>

* Apply suggestions from code review

* Apply suggestions from code review

Co-authored-by: Markus Napp <mnapp@suse.com>

adoc/admin-velero-backup.adoc

@@ -108,20 +108,22 @@ velero backup create backup-1 --selector app=elasticsearch-master
 
 ** Location
 +
-Pass `--storage-location` to specify where the backup stores to. For example, if we have HA object storage server called master and slave respectively.
+Pass `--storage-location` to specify where to store the backup. 
+For example, if we have an HA object storage server called default and secondary respectively.
 +
 [source,bash]
 ----
-# Create a backup to the master storage server
-velero backup create backup2master --storage-location master
+# Create a backup to the default storage server
+velero backup create backup2default --storage-location default
 
-# Create a backup to the slave storage server
-velero backup create backup2slave --storage-location slave
+# Create a backup to the secondary storage server
+velero backup create backup2secondary --storage-location secondary
 ----
 
 ** Garbage Collection
 +
-Pass `--ttl` to specify how long the backup should be kept, after that, the backup will be dumped into garbage (deleted). The default time for a backup to exist before it is deleted is 720 hours (30 days).
+Pass `--ttl` to specify how long the backup should be kept. After the specified time the backup will be deleted. 
+The default time for a backup before deletion is 720 hours (30 days).
 
 ** Exclude Specific Items from Backup
 +