fix: Use user namespace of template and ssh-key, fix: icon miss

[WuJun2016]

link

https://github.com/harvester/harvester/issues/724 https://github.com/harvester/harvester/issues/712 https://github.com/harvester/harvester/issues/736 https://github.com/harvester/harvester/issues/527 https://github.com/harvester/harvester/issues/737 https://github.com/harvester/harvester/issues/743 https://github.com/harvester/harvester/issues/744