Exclude requesters from Project#members, Group#members and User#members

app/controllers/admin/groups_controller.rb

app/controllers/admin/projects_controller.rb

app/controllers/concerns/membership_actions.rb

app/controllers/groups/group_members_controller.rb

app/controllers/projects/project_members_controller.rb

app/helpers/members_helper.rb

app/models/group.rb

app/models/member.rb

app/models/project.rb

app/models/project_team.rb

app/views/admin/groups/show.html.haml

app/views/admin/projects/show.html.haml

app/views/groups/group_members/index.html.haml

app/views/layouts/nav/_group_settings.html.haml

app/views/layouts/nav/_project.html.haml

.../projects/project_members/_shared_group_members.html.haml

app/views/projects/project_members/index.html.haml

app/views/shared/members/_access_request_buttons.html.haml

app/views/shared/members/_requests.html.haml

spec/controllers/groups/group_members_controller_spec.rb