Problem: Dump taken using 5.7 server cannot be restored on 8.0.

Analysis: DDLs of triggers, events or procedures have sql_mode set.
NO_AUTO_CREATE_USER sql_mode is also set along with the definitions.
This sql mode is removed from 8.0 thus restore of the dump file on 8.0
server fails.

Fix: Fix is to parse the sql_mode, look for NO_AUTO_CREATE_USER and remove
it when taking a dump of triggers, events or procedures.