Node.get_sstable() glob incorrect for C* 2.0

`ccmlib.Node.get_sstable` searches for data directories with [this glob](https://github.com/pcmanus/ccm/blob/master/ccmlib/node.py#L851). As shown [here](https://github.com/pcmanus/ccm/blob/master/ccmlib/node.py#L843), the glob for the table-specific directory is `{tablename}-*`. e.g., if the table is called `cf`, it expects directories matching `cf-*`.

However, here's a data directory I found running a test on C\* 2.0:

```
$ pwd
/tmp/dtest-d6Etl2/test/node1/data/ks/cf
$ ls
ks-cf-jb-1-CompressionInfo.db ks-cf-jb-1-Data.db ks-cf-jb-1-Filter.db ks-cf-jb-1-Index.db ks-cf-jb-1-Statistics.db ks-cf-jb-1-Summary.db ks-cf-jb-1-TOC.txt
```

As shown above, the actual folder is named `cf`, which isn't matched by `cf-*`.

I'd send a PR, but I don't know how these folders are laid out in the general case. Should this match against just the table name in 2.0?