GPFS error messages for snapshot status errors

Certain error messages for snapshot status error have no error message numbers and may be recognized by the message texts only.

The error messages for this type of problem do not have message numbers, but can be recognized by their message text:

'Cannot delete snapshot snapshotName which is snapshotState, error = errorCode.'
'Cannot restore snapshot snapshotName which is snapshotState, error = errorCode.'
'Previous snapshot snapshotName is invalid and must be deleted before a new snapshot may be created.'
'Previous snapshot snapshotName must be restored before a new snapshot may be created.'
'Previous snapshot snapshotName is invalid and must be deleted before another snapshot may be deleted.'
'Previous snapshot snapshotName is invalid and must be deleted before another snapshot may be restored.'
'More than one snapshot is marked for restore.'
'Offline snapshot being restored.'