main, vmm: Add new --numa parameter

Through this new parameter, we give users the opportunity to specify a
set of CPUs attached to a NUMA node that has been previously created
from the --memory-zone parameter.

This parameter will be extended in the future to describe the distance
between multiple nodes.

For instance, if a user wants to attach CPUs 0, 1, 2 and 6 to a NUMA
node, here are two different ways of doing so:
Either
	./cloud-hypervisor ... --numa id=0,cpus=0-2:6
Or
	./cloud-hypervisor ... --numa id=0,cpus=0:1:2:6

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

src/main.rs

@@ -221,6 +221,14 @@ fn create_app<'a, 'b>(
                 .number_of_values(1)
                 .group("vm-config"),
         )
+        .arg(
+            Arg::with_name("numa")
+                .long("numa")
+                .help(config::NumaConfig::SYNTAX)
+                .takes_value(true)
+                .min_values(1)
+                .group("vm-config"),
+        )
         .arg(
             Arg::with_name("v")
                 .short("v")
@@ -566,6 +574,7 @@ mod unit_tests {
                 iommu: false,
                 #[cfg(target_arch = "x86_64")]
                 sgx_epc: None,
+                numa: None,
             };
 
             aver_eq!(tb, expected_vm_config, result_vm_config);