Fix check in support bundle (#3583) (#3628)

Before the upload support bundle direct method, support bundle was only called from the iotedge tool. This made it easy to get the iotedge executable using the first argument. Now that iotedged also calls support bundle, it needs to rely on the path to find the iotedge tool.

edgelet/support-bundle/src/support_bundle.rs

@@ -376,9 +376,14 @@ where
     }
 
     fn write_check(mut self) -> Result<Self, Error> {
-        let iotedge = env::args().next().unwrap();
         self.print_verbose("Calling iotedge check");
 
+        let mut iotedge = env::args().next().unwrap();
+        if iotedge.contains("iotedged") {
+            self.print_verbose("Calling iotedge check from edgelet, using iotedge from path");
+            iotedge = "iotedge".to_string();
+        }
+
         let mut check = ShellCommand::new(iotedge);
         check.arg("check").args(&["-o", "json"]);
 
@@ -397,6 +402,10 @@ where
             .write_all(&check.stdout)
             .map_err(|err| Error::from(err.context(ErrorKind::SupportBundle)))?;
 
+        self.zip_writer
+            .write_all(&check.stderr)
+            .map_err(|err| Error::from(err.context(ErrorKind::SupportBundle)))?;
+
         self.print_verbose("Wrote check output to file");
         Ok(self)
     }