fix: import failing on large tables

Channel close method closes the client channel and does
not wait for the remote process to exit. This was causing
download of incomplete dump file, causing the import to fail.

src/main.rs

@@ -279,7 +279,14 @@ fn main() -> Result<(), Box<dyn Error>> {
     let mut channel = sess.channel_session().ok().unwrap();
     let exit_status = channel
         .exec(&arg)
-        .and_then(|_| channel.close())
+        .and_then(|_| {
+            let mut stdout = String::new();
+            let mut stderr = String::new();
+            channel.read_to_string(&mut stdout).unwrap();
+            channel.stderr().read_to_string(&mut stderr).unwrap();
+
+            channel.wait_close()
+        })
         .and_then(|_| channel.exit_status());
 
     match exit_status {
@@ -337,8 +344,6 @@ fn main() -> Result<(), Box<dyn Error>> {
         _ => warn!("Failed to delete temporary file from remote filesystem."),
     }
 
-    // TODO: Delete temporary file from remote filesystem
-
     let f = BufReader::new(File::open(&path).unwrap());
 
     let v = vec!["-u", &db_user, &pass_arg, &db_name];