OpenFlow cookie prefixes

Each NApp that sends FlowMod is encouraged to have a configurable and reserved 1-byte cookie prefix to identify which NApp owns a particular flow, to also facilitate queries, debugging and general troubleshooting. This byte is set as the most significant byte.

Currently, the following OpenFlow cookie prefixes have been reserved:

NApp OpenFlow cookie prefix / 56
telemetry 0xA8
mef_eline 0xAA
of_lldp 0xAB
coloring 0xAC