Merge pull request #30 from Mic92/clippy

fix clippy warnings

Author: Mic92

src/container/containerd.rs

@@ -11,7 +11,7 @@ pub struct Containerd {}
 
 impl Container for Containerd {
     fn lookup(&self, container_id: &str) -> Result<Pid> {
-        let command = format!("ctr task list");
+        let command = "ctr task list";
         let output = tryfmt!(
             Command::new("ctr").args(&["task", "list"]).output(),
             "Running '{}' failed",

src/fs.rs

@@ -258,7 +258,7 @@ impl CntrFs {
         Ok(fd)
     }
 
-    pub fn spawn_sessions<'a>(self) -> Result<Vec<JoinHandle<io::Result<()>>>> {
+    pub fn spawn_sessions(self) -> Result<Vec<JoinHandle<io::Result<()>>>> {
         let mut sessions = Vec::new();
 
         // numbers of sessions is optimized for cached read