LU-6245 libcfs: remove tcpip abstraction from libcfs

LU-6245 libcfs: remove tcpip abstraction from libcfs

Since libcfs no longer builds for user land we can
move the tcpip abstraction that exist to the LNET
layer which is the only place that uses it. Also
the migrated code will use native linux kernel
apis directly instead of with wrappers.

Change-Id: Iaa39e4f581f18cfe586feb5bfbf4233a2f2335c7
Signed-off-by: James Simmons <uja.ornl@gmail.com>
Reviewed-on: http://review.whamcloud.com/13760
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Isaac Huang <he.huang@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>