Commits on Jan 18, 2019

1. Add capability create consistent transactions …

   To make this possible, some things are added:
    - The capability to lock all tables on a tablet, to momenterily stop updates
    - Once the database is locked, we can create multiple consistent snapshot
      transactions that all share the same view of the data
    - Adds the capability to have replication move forward to a specific point
      in the transaction log
   
   This commit also refactors tabletserver and tx_engine, moving logic of
   state transitions into the tx engine.
   
   Signed-off-by: Andres Taylor <antaylor@squareup.com>

   

   systay committed Jan 18, 2019
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