Include lock stores in HBase short CF names map

Now the _lock_ counterparts to the vertex index, edge index, edge
store, and id store are also shortened.  The one-char short names of
the lock stores alphabetically follow the one-char short names of
their non-lock counterparts.  The id store maps to "i" and the id lock
store maps to "j", etc.
Statically check HBase short CF name integrity

New static initializer guarantees that the map of long CF names to
short equivalents is injective, that is, that no two distinct long
names map to the same short name.
Convert HBase short CF name map to bimap

Also, when configured to shorten CF names, make the HBase store
manager sanity-check CF names passed into openDatabase.  shortnames of
the longname<->shortname bimap are disallowed.  Only longnames or
strings that aren't present on either side of the bimap are allowed.
Replace RandomPartitioner with Murmur3 in tests

The last use of RandomPartitioner is now in the cassandra.yaml file
packed in the distribution zipfiles.