Ticket 49789 - By default, do not manage unhashed password
By default, unhashed#user#password is recorded into changelog database.
It is a specific use when some plugin need to know the clear text password on update.
This should be disabled ('off') by default
Switch the default value from 'on' to 'off'
Reviewed by: Viktor Ashirov, Simon Pichugi, Mark Reynolds
Platforms tested: F27
Flag Day: no
Doc impact: no