Bug #27349579 SEVERE PERFORMANCE REGRESSION IN SERVER BOOTSRAP

Post-push fix.

Setting innodb_flush_log_at_trx_commit=0 is does not work reliably for
DDL operations. Revert to REPLACE statements in one transaction as a
quick fix.

Change-Id: I44094afae315038931a28dac5ba2f4a0ff037c35

Author: nryeng