Compress and encrypt the image when uploading and storing the image in glance for glance_store

When we make a qcow2 image and prepare to upload it to glance,the image usually be large and can be compress,so it's better to compress the image in the client side and upload the compressed image to glance,which will save much store space. compress wiki--https://pve.proxmox.com/wiki/Shrink_Qcow2_Disk_Files Also,th...