Comment 2 for bug 1571865

From log:

2016-04-18T22:13:30.875218Z 0 [Warning] System table 'plugin' is expected to be transactional.
2016-04-18T22:13:30.875411Z 0 [ERROR] Function 'innodb' already exists
2016-04-18T22:13:30.875459Z 0 [Warning] Couldn't load plugin named 'innodb' with soname 'ha_innodb.so'.
2016-04-18T22:13:30.875477Z 0 [ERROR] Function 'federated' already exists
2016-04-18T22:13:30.875487Z 0 [Warning] Couldn't load plugin named 'federated' with soname 'ha_federated.so'.
2016-04-18T22:13:30.875498Z 0 [ERROR] Function 'blackhole' already exists
2016-04-18T22:13:30.875506Z 0 [Warning] Couldn't load plugin named 'blackhole' with soname 'ha_blackhole.so'.
2016-04-18T22:13:30.875517Z 0 [ERROR] Function 'archive' already exists
2016-04-18T22:13:30.875525Z 0 [Warning] Couldn't load plugin named 'archive' with soname 'ha_archive.so'.
2016-04-18T22:13:30.876258Z 0 [ERROR] unknown variable 'key_buffer=16K'
2016-04-18T22:13:30.876347Z 0 [ERROR] Aborting