vmm: Remove 'file' option from MemoryConfig

After the introduction of user defined memory zones, we can now remove
the deprecated 'file' option from --memory parameter. This makes this
parameter simpler, letting more advanced users define their own custom
memory zones through the dedicated parameter.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

src/main.rs

@@ -526,7 +526,6 @@ mod unit_tests {
                 },
                 memory: MemoryConfig {
                     size: 536_870_912,
-                    file: None,
                     mergeable: false,
                     hotplug_method: HotplugMethod::Acpi,
                     hotplug_size: None,
@@ -644,18 +643,6 @@ mod unit_tests {
                 }"#,
                 true,
             ),
-            (
-                vec![
-                    "cloud-hypervisor", "--kernel", "/path/to/kernel",
-                    "--memory",
-                    "size=1G,file=/path/to/shared/file",
-                ],
-                r#"{
-                    "kernel": {"path": "/path/to/kernel"},
-                    "memory": {"size": 1073741824, "file": "/path/to/shared/file"}
-                }"#,
-                true,
-            ),
             (
                 vec!["cloud-hypervisor", "--kernel", "/path/to/kernel", "--memory", "size=1G,mergeable=on"],
                 r#"{