stop deleting user sessions when updating user data

[Cecilia Vela Gurovic]

the user sessionids are removed from the DB
to prevent users from reseting the user data when they are logged in
while their user is being updated through CSV file

But this also removes sessions when updating a user through web services
making the user be logged out

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/9109

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/9109
Committed: https://git.mahara.org/mahara/mahara/commit/59e381ef7f4d2592a0f6f51fd3570f4138aa8870
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit 59e381ef7f4d2592a0f6f51fd3570f4138aa8870
Author: Cecilia Vela Gurovic <email address hidden>
Date: Wed Sep 5 11:30:16 2018 +1200

Bug 1790742: stop deleting user sessions when updating user data

the user sessionids are removed from the DB
to prevent users from reseting the user data when they are logged in
while their user is being updated through CSV file

this fix deletes the sessionids when uploading CSV files
and not in the update_user general function
to prevent logging out of the user when updating through web services

behatnotneeded

Change-Id: I3eca84dd10a035c4b9fe3ad180ca8ba32746b3c6