Tunnel: Cleanup old tunnel infrastructure.

Tunnel: Cleanup old tunnel infrastructure.

Since userspace flow based tunneling code is checked in, the kernel
port based tunneling code can be removed.

Patch removes following components:
 - tunnel ports hash table and moved tunnel ports list to individual
   vports.
 - Cleaned per tnl-port config.
 - OVS_KEY_ATTR_TUN_ID action is removed.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
Bug #15078