[GitHub] [cloudstack] ustcweizhou opened a new pull request #3635: server: acquire IPv4 address when add secondary IP to nic if IP is not specified

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ustcweizhou opened a new pull request #3635: server: acquire IPv4 address when add secondary IP to nic if IP is not specified
URL: https://github.com/apache/cloudstack/pull/3635
 
 
   
   
   ## Description
   
   After commit fbf488497fb863c13fc0908281e3f4f86906df43, admin need to specify an ipv4 or ipv6 addresses when add IP to nic which breaks backward compatibity. If IP is not specified, a IPv4 address should be returned.
   
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   ## Types of changes
   <!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
   - [ ] Breaking change (fix or feature that would cause existing functionality to change)
   - [ ] New feature (non-breaking change which adds functionality)
   - [X] Bug fix (non-breaking change which fixes an issue)
   - [ ] Enhancement (improves an existing feature and functionality)
   - [ ] Cleanup (Code refactoring and cleanup, that may add test cases)
   
   ## Screenshots (if appropriate):
   
   ## How Has This Been Tested?
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   When I add an IP to a nic and do not specify an IP, 
   
   Before this PR, it gives an error "Allocating ip to guest nic 111 failed"
   After this PR, it succeeds.
   
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