clutsre upgrade version check error

[Xvv-v]

Describe the Bug

Versions Used
Kubernetes: v1.18.20, v1.19.16
Kubeclipper: v1.3.1

Environment
How many nodes and their hardware configuration:

For example: CentOS 7.5 / 3 masters: 8cpu/8g; 3 nodes: 8cpu/16g
(and other info are welcomed to help us debugging)

How To Reproduce
Steps to reproduce the behavior:

1. create a cluster
2. do upgrade operation
3. see error

Expected behavior
A clear and concise description of what you expected to happen.

[moweiwei]

#314