Rename group member specs for consistent naming

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

spec/features/groups/members/list_spec.rb → spec/features/groups/members/list_members_spec.rb

 require 'spec_helper'
 
-feature 'Groups members list', feature: true do
+feature 'Groups > Members > List members', feature: true do
   include Select2Helper
 
   let(:user1) { create(:user, name: 'John Doe') }

spec/features/groups/members/owner_manages_access_requests_spec.rb → spec/features/groups/members/manage_access_requests_spec.rb

 require 'spec_helper'
 
-feature 'Groups > Members > Owner manages access requests', feature: true do
+feature 'Groups > Members > Manage access requests', feature: true do
   let(:user) { create(:user) }
   let(:owner) { create(:user) }
   let(:group) { create(:group, :public, :access_requestable) }

spec/features/groups/members/manage_members.rb

+require 'spec_helper'
+
+feature 'Groups > Members > Manage members', feature: true do
+end

spec/features/groups/members/requests_access_spec.rb → spec/features/groups/members/request_access_spec.rb

 require 'spec_helper'
 
-feature 'Groups > Members > Requests access', feature: true do
+feature 'Groups > Members > Request access', feature: true do
   let(:user) { create(:user) }
   let(:owner) { create(:user) }
   let(:group) { create(:group, :public, :access_requestable) }

spec/features/groups/members/sorting_spec.rb → spec/features/groups/members/sort_members_spec.rb

 require 'spec_helper'
 
-feature 'Groups > Members > Sorting', feature: true do
+feature 'Groups > Members > Sort members', feature: true do
   let(:owner)     { create(:user, name: 'John Doe') }
   let(:developer) { create(:user, name: 'Mary Jane', last_sign_in_at: 5.days.ago) }
   let(:group)     { create(:group) }