vmm: Add the 'shared' and 'hugepages' controls to MemoryConfig

The new 'shared' and 'hugepages' controls aim to replace the 'file'
option in MemoryConfig. This patch also updated all related integration
tests to use the new controls (instead of providing explicit paths to
"/dev/shm" or "/dev/hugepages").

Fixes: #1011

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Signed-off-by: Bo Chen <chen.bo@intel.com>

vmm/src/api/openapi/cloud-hypervisor.yaml

@@ -380,6 +380,12 @@ components:
         hotplug_method:
           type: string
           default: "acpi"
+        shared:
+          type: boolean
+          default: false
+        hugepages:
+          type: boolean
+          default: false
 
     KernelConfig:
       required: