Add create_vm_proxmox_scsi variable

This variable allows the user to specify SCSI disks that they would like
to be created.  Allows them to specify a size, where the drive should
live and the format of the drive.

tasks/proxmox.yml

@@ -47,6 +47,7 @@
     vcpus: "{{ create_vm_proxmox_numb_cpus | default(omit) }}"
     cores: "{{ create_vm_proxmox_numb_cores | default(omit) }}"
     memory: "{{ create_vm_proxmox_memory_mb | default(omit) }}"
+    scsi: "{{ create_vm_proxmox_scsi | default(omit) }}"
     virtio: "{{ create_vm_proxmox_virtio_disks | default(omit) }}"
     net: "{{ create_vm_proxmox_net | default(omit) }}"
   when: