implement support for creating domains

xencall/examples/domain_create.rs

@@ -0,0 +1,11 @@
+use xencall::domctl::DomainControl;
+use xencall::sys::CreateDomain;
+use xencall::{XenCall, XenCallError};
+
+fn main() -> Result<(), XenCallError> {
+    let mut call = XenCall::open()?;
+    let mut domctl: DomainControl = DomainControl::new(&mut call);
+    let info = domctl.create_domain(CreateDomain::default())?;
+    println!("created domain {}", info.domid);
+    Ok(())
+}