1. Add client module to request openstack api
2. Remove window.request, stores use client to request api
3. Remove window.globals, use globalRootStore to deal with user info
Change-Id: I5657cfd8cf142dbacce8716991f805bbbb4a9222
1. Fix system_reader role has operation permissions on administrator page
2. Mark TODO of supported system scope roles
Change-Id: Icd697e0b5238a25307c3d24fc6742600f892b547