TINKERPOP-3217 Add server option to close Session automatically.

[kenhuuu]

The added destroySessionPostGraphOp setting enables re-using the same underlying connection for a different subsequent Session. This should increase performance for cases where many short-lived Transactions are sent to the server.

https://issues.apache.org/jira/browse/TINKERPOP-3217

VOTE +1

[Cole-Greer]

VOTE +1

[andreachild]

VOTE +1

[andrii0lomakin]

Thank you, @kenhuuu, nice feature. Will port to our version too.