Support for interpreting meter-id and write-metadata action in core

Support for interpreting meter-id and write-metadata action in flow decomposer

This feature need to be ported from the 1.x branch

The following are available in 1.x for the support of meter id in the flow decomposer

• Update flow count field of meter stats
• ONU root field was True and because of this flow decomposer was not working properly - it is fixed (now onu root field is false) - related to VOL-1354
• Meter & write metadata support is added to vcli
• No-action (drop) flow support is added.
• Removed broken wildcard inport support and in-band control support
• Meter functions (meter stats reply, meter modify etc.) are fixed
• Metadata information  passed on to the OLT and ONU Adapters.
• Meter Reference in all Flow Tables passed on to the OLT and ONU Adapters.
• Fixed unit tests and added more unit tests
• Fixed ponsim (partially) to deal with changes to flow decomposer