need to drop old default email option

[Robert Lyon]

Now that we use individual default email options for each activity type we need a patch to remove the 'defaultnotificationmethod' from config table.

But the problem is we can't add it to the lib/db/upgrade.php as that is run before the upgrade on plugins - nor can we put it in the postinst of a plugin because we don't know which plugins will need to be updated last post 1.9 - eg if we go from 1.9 -> 1.10 or even 1.9 -> 1.15 we will need to know the old defaultmethod. But after the initial jump we will not need to know about it.

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/8028

[Robert Lyon (robertl-9)]

Can fix this easily now as we recommend upgrading to 15.04 from older sites before upgrading to 17.10+

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/8028
Committed: https://git.mahara.org/mahara/mahara/commit/1238a95bd696204a259afcea728582481c534eca
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit 1238a95bd696204a259afcea728582481c534eca
Author: Robert Lyon <email address hidden>
Date: Tue Sep 19 12:25:21 2017 +1200

Bug 1381184: Removing obsolete config value

This value would be present in < 1.10 versions

behatnotneeded

Change-Id: Ic92beea1a209580f798716227a7c53fb600a8869
Signed-off-by: Robert Lyon <email address hidden>