main: Delay converting command line to VM params

Generate the VM params until after the logging has been enabled. This
will make it possible to reuse the logging for vhost backends.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>

src/main.rs

@@ -289,8 +289,6 @@ fn main() {
     )
     .get_matches();
 
-    let vm_params = config::VmParams::from_arg_matches(&cmd_arguments);
-
     let log_level = match cmd_arguments.occurrences_of("v") {
         0 => LevelFilter::Error,
         1 => LevelFilter::Warn,
@@ -315,6 +313,7 @@ fn main() {
     .map(|()| log::set_max_level(log_level))
     .expect("Expected to be able to setup logger");
 
+    let vm_params = config::VmParams::from_arg_matches(&cmd_arguments);
     let vm_config = match config::VmConfig::parse(vm_params) {
         Ok(config) => config,
         Err(e) => {