mount - add a newline at the end of line in fstab

* Fixes #210

Signed-off-by: Hideki Saito <saito@fgrep.org>

plugins/modules/mount.py

@@ -254,6 +254,10 @@ def _set_mount_save_old(module, args):
             '%(src)s - %(name)s %(fstype)s %(passno)s %(boot)s %(opts)s\n')
 
     for line in open(args['fstab'], 'r').readlines():
+        # Append newline if the line in fstab does not finished with newline.
+        if not line.endswith('\n'):
+            line += '\n'
+
         old_lines.append(line)
 
         if not line.strip():