WL#3515: Partitioning: Add support for handlerton flags

Affects: Server-7.1   —   Status: Un-Assigned   —   Priority: Medium

From Brian Aker's analysis of partition code:

The current partitioning code does not support handlerton
flags. It should.

MySQL Engineering should therefore amend the partitioning
code so that handlerton flags are supported by partitioning.