rbd: use internal as default error code in getGRPCError()

This commit replaces codes.Unknown with codes.Internal
as the default error code in getGRPCError().

Signed-off-by: Rakshith R <rar@redhat.com>

internal/csi-addons/rbd/replication.go

@@ -792,8 +792,8 @@ func getGRPCError(err error) error {
 		}
 	}
 
-	// Handle any other non nil error not listed in the map
-	return status.Error(codes.Unknown, err.Error())
+	// Handle any other non nil error not listed in the map as internal error
+	return status.Error(codes.Internal, err.Error())
 }
 
 // GetVolumeReplicationInfo extracts the RBD volume information from the volumeID, If the