DiskBalancer: Force rebase diskbalancer branch

In one of patches we renamed – DiskbalancerException.java to DiskBalancerException.java. The only change was the small b ==> B, This causes issues on a Mac where the file system may not be case sensitive.

So when you clone the repo, git ends up creating DiskbalanceException.java with a small letter ‘b’ and tries to rename it to big letter. However on a Mac it fails and we get java files where the class name is different from the file name.

We can fix this issue by re-writing the git history.