Commits on Mar 13, 2019

1. properties: upgrade HBaseVertex to support multi-properties …

   The HBase graph tinkerpop implementation specifies Cardinality.single as
   the default.  Since HBase does not (at the time of this writing) support
   multiple values, this feature wraps the multi-values in a list and
   writes the list to HBase.  As a consequence of this list wrapper,
   indexed properties can still only support-single value properties.
   
   When reading/writing from HBase, most properties will be written as
   single objects.  Only when a property is specifically added with
   non-single cardinality will it be written to HBase as a list.
   
   In order to avoid java native serialization, the serialization of
   non-single property values uses Kryo (with a small lightweight wrapper
   class to accomplish this).

   Michael Rappazzo committed Mar 13, 2019
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