[dashboard] Allow marking images metadata with glance v2 api

[Kirill Zaitsev]

Horizon now supports glance v2 api. It doesn't have copy_from functionality, but has metadata functionality. We should allow murano-dashbord to use glance v2 client for that purporse

may be done as part of https://blueprints.launchpad.net/murano/+spec/migrate-to-glance-v2 bp

[zhurong (zhu-rong)]

Now the metadata had already using V2.
Update metadata:https://github.com/openstack/murano-dashboard/blob/master/muranodashboard/images/forms.py#L109
Remove metadata:https://github.com/openstack/murano-dashboard/blob/master/muranodashboard/images/tables.py#L56
Just now, only the list images using the v1 api.