ENG-5096: Add a partition to master HSID map to MpTransactionState for sysproc.

I intentionally didn't change the existing master HSID list to avoid
touching the sensitive failure resolution code. The parallel map added
here is only used for sysproc.
Merge pull request #775 from VoltDB/ENG-5096-cont

Thread the master HSID map through to the MpTransactionState for sysproc