skip storageClass check if there is no PVC size change

[shichanglin5]

after helm upgrade : "storage class for PVC doesn't support live resizing" begin appear in the log I have not modified the size of pvc, this kind of log should not appear

问题分析：

1. should first judge whether the size of pvc changes
2. then judge whether expand is supported,
3. but now the judgment of whether pvc size changes is in the following growPVCs.