support for new NXM fields introduced in ovs2.8:

NXM_NX_CT_TP_SRC (124)

NXM_NX_CT_TP_DST (125)

==========================

Name: ct_tp_src
Width: 16 bits
Format: decimal
Masking: arbitrary bitwise masks
Prerequisites: CT
Access: read-only
OpenFlow 1.0: not supported
OpenFlow 1.1: not supported
OXM: none

NXM: NXM_NX_CT_TP_SRC (124) since Open vSwitch 2.8

==========================

Name: ct_tp_dst
Width: 16 bits
Format: decimal

Masking: arbitrary bitwise masks
Prerequisites: CT
Access: read-only
OpenFlow 1.0: not supported
OpenFlow 1.1: not supported
OXM: none
NXM: NXM_NX_CT_TP_DST (125) since Open vSwitch 2.8