vlib: Alias RX or TX to direction
vlib: Alias RX or TX to direction

Type: improvement

for those that find that name usefull.

Signed-off-by: Neale Ranns <b9c0e9ef0223633bc2f318425f615cf5840a0be7@cisco.com>
Change-Id: I6c99bcdbb10ca1615aeea6924c2d93a68b5b7684

FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp