10-07  user fix vulnerability
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# Purpose:
To test clair scan image vulnerablity correct after user fix it.  

# Reference:
User guide.  

# Environment:
* This test requires that one Harbor instance is running and availiable.  
* Harbor is installed with clair enable.  
* A Linux host with Docker client installed.  
* Clair has been updated to the latest.  

# Test Steps:
1. Login Harbor as admin.  
2. Push some images with vulnerability.  
3. Scan an image with vulnerability and record the result.  
4. Upgrade the image to fix vulnearbility.  
5. Rescan the same image and check the result.  

# Expect Outcome:
* Step5 number of vulnerability should less than step3.  

# Possible Problem:
None
