Description of problem:

 Currently, split-brain logs are not cleared after resolution. This may (and does) confuse users who manually heal/fix split-brain'ed files but still see them in this log. Its equally confusing that if you miss files in this process and heal again, the split-brain list grows. 

How reproducible:

 Every time

Steps to Reproduce:
1. Create volume with replica 2
2. Cause split-brain on 1 file
3. Manually fix split-brain
4. Log entry still appears
  
Expected results:

 It would be great if the split-brain list was cleared when starting another heal. Or if the files could be removed from the list once the split-brain state was fixed manually.