Squashed commit of the following:

syscalls/:  Add syscall support for if_nametoindex() and if_indextoname()
    net/: Update some comments.

net/netdev/netdev_count.c

@@ -64,9 +64,6 @@
  * Returned Value:
  *   The number of network devices
  *
- * Assumptions:
- *  Called from normal user mode
- *
  ****************************************************************************/
 
 int netdev_count(void)