KUDU-2612 flag for txn status table's replication factor

This patch adds --txn_manager_status_table_num_replicas flag to control
the replication factor of the transaction status table.  By default,
the flag is set to 3.  It is a kudu-master's flag since TxnManager is
hosted by kudu-master process.

Change-Id: Ic5f76122ea1ef56f72e416ab12f6908703fc610e
Reviewed-on: http://gerrit.cloudera.org:8080/16750
Tested-by: Kudu Jenkins
Reviewed-by: Andrew Wong <awong@cloudera.com>
3 files changed