Use simple unchangable identifiers for partition names

[jcjones]

After #51, we should stop performing renames of partition names to "keep them correct" and keep them as a simple identifier that does not change.

[jcjones]

I kinda wonder if we should instead use a non-date numbering scheme, just something starting from 0, so we can strip all the logic for maintaining names out.

[jcjones]

This still causes spurious DuplicatePartitionExceptions.

[jcjones]

See #46

[jcjones]

After #51, we should stop performing renames of partition names to "keep them correct" and instead either keep them as their initial prediction, or (better yet) use an incrementing simple identifier that does not change.