[BK] TUN driver updates and fixes for 2.6

[Max Krasnyansky <maxk@xxxxxxxxxxxx>]

Dave, 

Please pull from
        bk://linux-bt.bkbits.net/tun-2.5

This will update the following files:

 drivers/net/tun.c      |   99 ++++++++++++++++++++++++-------------------------
 include/linux/if_tun.h |    8 +--
 2 files changed, 53 insertions(+), 54 deletions(-)

through these ChangeSets:

<maxk@xxxxxxxxxxxx> (03/10/21 1.1348)
   [TUN] TUN/TAP driver updates and fixes.
   
   - Cleanup debug macros. 
   Replaced DBG() with TUN_DBG() to avoid conflicts.
   
   - Autodetect IP version and set protocol accordingly.
   
   - Use set_current_state() instead of accessing current->state directly.
    
   - Optimized net device registration.
   Do not call dev_get_by_name() unless name has '%' character in it. 
   This avoids extra scan of the net device list.
   
   - Return error code returned by misc_register() (instead of EIO) in
   case of failure.

Thanks

Max

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