change_project_membership is very slow for projects with lots of slices

[MarshallBrinn]

When we a change the project lead of a project, we loop over all slices of the project and do a separate call to make sure the admin is a lead of the the slice (either adding or changing role).

This can take a lot of time if there are lots of slices.

Instead we should be able to make this in a small number of calls.

Imported from trac ticket #315, created by mbrinn on 07-01-2014 at 15:03, last modified: 07-01-2014 at 16:06

[ahelsing]

This is also true when changing the project admins of a project, since they too must be added to all slices.

Trac comment by ahelsing on 07-01-2014 at 16:06