admin: Update User list page
admin: Update VM list page
admin: Add Volume list page
admin: Add Network list page
admin: Add IP list page
admin: Update Project list page
admin: Add User Group list page
admin: Add Auth Provider list page
admin: Remove unnecessary templates and tags
Merge branch 'feature-admin-extra-models' into feature-admin

Fix apyrgio/synnefo#43 and also fix apyrgio/synnefo#36