container: implement exit code xenbus notification

shared/src/lib.rs

@@ -25,15 +25,9 @@ pub struct LaunchNetwork {
     pub resolver: LaunchNetworkResolver,
 }
 
-#[derive(Serialize, Deserialize, Debug)]
-pub struct LaunchChannels {
-    pub exit: String,
-}
-
 #[derive(Serialize, Deserialize, Debug)]
 pub struct LaunchInfo {
     pub network: Option<LaunchNetwork>,
     pub env: Option<Vec<String>>,
     pub run: Option<Vec<String>>,
-    pub channels: LaunchChannels,
 }