feat(backup,restore): adding validation for backup and restore

Added a schema validation for backup and restore CR. Also validating
the server address in the backup/restore controller.

Validating the server address as :

^([0-9]+.[0-9]+.[0-9]+.[0-9]+:[0-9]+)$

which is :

<any number>.<any number>.<any number>.<any number>:<any number>

Here we are validating just the format of the IP, not validating that IP should be
correct which  will be little more complex. In any case if IP is not correct,
the zfs send will fail, so no need to do complex validation to validate the
correct IP and port.

Signed-off-by: Pawan <pawan@mayadata.io>

deploy/zfs-operator.yaml

@@ -895,6 +895,7 @@ spec:
             backupDest:
               description: BackupDest is the remote address for backup transfer
               minLength: 1
+              pattern: ^([0-9]+.[0-9]+.[0-9]+.[0-9]+:[0-9]+)$
               type: string
             ownerNodeID:
               description: OwnerNodeID is a name of the nodes where the source volume
@@ -920,6 +921,13 @@ spec:
           type: object
         status:
           description: ZFSBackupStatus is to hold status of backup
+          enum:
+          - Init
+          - Done
+          - Failed
+          - Pending
+          - InProgress
+          - Invalid
           type: string
       required:
       - spec
@@ -993,6 +1001,7 @@ spec:
               description: it can be ip:port in case of restore from remote or volumeName
                 in case of local restore
               minLength: 1
+              pattern: ^([0-9]+.[0-9]+.[0-9]+.[0-9]+:[0-9]+)$
               type: string
             volumeName:
               description: volume name to where restore has to be performed
@@ -1005,6 +1014,13 @@ spec:
           type: object
         status:
           description: ZFSRestoreStatus is to hold result of action.
+          enum:
+          - Init
+          - Done
+          - Failed
+          - Pending
+          - InProgress
+          - Invalid
           type: string
       required:
       - spec