This patch only deals with:
1) removing passwords from existing event_log table data
2) stopping the recording of passwords into the event_log table
3) sets the reset password on next login for those users

It doesn't deal with removing the unnecessary cruft information
that will be handled by the bug 1692385

behatnotneeded

Change-Id: Id29148f78fa6918f5f5afcb89d211ccb3b60c95b
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>