add SINGLE type edge for two partitioned vertex can not duplicate removal

Moon Hu <199512...@...>

- Janusgraph Version: 0.0.3
- Storage Backend: hbase 1.2.6
- Mixed Index Backend:elasticsearch 6.3.0

I have two partitioned vertex ,vertex id is 57402 and 30245090, and i defined a SIMPLE  type edge named 'father', i add this relation for the vterices ten times, i can query ten relations from graph