Commits on Feb 3, 2020

1. client,kv: new savepoint API …

   This patch introduces the KV savepoint API as discussed in the
   savepoints RFC:
   
   ```go
   	// CreateSavepoint establishes a savepoint.
   	// This method is only valid when called on RootTxns.
   	CreateSavepoint(context.Context) (SavepointToken, error)
   
   	// RollbackToSavepoint rolls back to the given savepoint. The
   	// savepoint must not have been rolled back or released already.
   	// All savepoints "under" the savepoint being rolled back
   	// are also rolled back and their token must not be used any more.
   	// This method is only valid when called on RootTxns.
   	RollbackToSavepoint(context.Context, SavepointToken) error
   
   	// ReleaseSavepoint releases the given savepoint. The savepoint
   	// must not have been rolled back or released already.
   	// All savepoints "under" the savepoint being released
   	// are also released and their token must not be used any more.
   	// This method is only valid when called on RootTxns.
   	ReleaseSavepoint(context.Context, SavepointToken) error
   ```
   
   Release note: None

   

   knz committed Feb 3, 2020
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