New port description data structures for 1.4

This is part of FlowForwarding/LINC-Switch#162.
Add PBB UCA match field

This is part of FlowForwarding/LINC-Switch#163.
Add push_pbb and pop_pbb to ofp_v5_utils:mk_action
Readd ofp_table_config enum

It was rendered obsolete in 1.3, but has two valid values in 1.4.

This is part of FlowForwarding/LINC-Switch#164.
ofp_table_mod properties

This is part of FlowForwarding/LINC-Switch#165.