When the hotplug attachment pod is deleted, the VMI
volumestatus goes back to bound, which triggers the
manager to detach the volume from the running VM
interrupting any IO on that volume. The pod is then
re-created and the volume gets re-attached and operation
can continue, but if the volume is mounted, it needs
to be re-mounted in the VM.

This commit modifies the logic so that if the volume is
ready, it cannot go back to bound if the attachment pod
disappears. This prevents the detachments and issues with
IO on the running VM.

Signed-off-by: Alexander Wels <awels@redhat.com>

Remove unneeded phase check, and move other check into
its own function in case we need more elaborate checks

Signed-off-by: Alexander Wels <awels@redhat.com>