Removed propMap conversion in loadVertex.
Removed propMap conversion in loadVertex.

Previously, loadVertex would take an array of key value pairs and
convert it into a Map<String, List<String>>. Now the method directly
takes this data structure.

jdellithorpe/torc-gremlin,jdellithorpe/torc-gremlin,ellitron/ramcloud-gremlin,ellitron/ramcloud-gremlin