moving counter registration to init() methods, and use of metadata constants

 - flushNow is a property of the update instead of the event
 - event timestamp is displayed in ISO8601 style
 - event registry returns an event updater object instead of the eventId
 - event update is done with a user defined object which is accessed via reflection and annotations
 - metadata is expressed using varargs and metadata string constants
 - changed unit tests

Update CLI to decode vendor action data as keys in the vendor data json dictionary

This reverts commit fe65e1b760c56be4c1e83f0cfadf06483aa4d51e.

fix typo

fix typo

Implemented backend for the REST API to retrieve the flow path between a pair of hosts

fix typo

fix typo

Implemented backend for the REST API to retrieve the flow path between a pair of hosts

Fixing the REST API to account for hierarchical counters
More unit tests.

of performace of updates. Introducing hierarchical counters, counter metatdata
and finer-grained handling of counter flush. Added unit tests and changed some
of the API calls

Still work in progress but pushing to unrelated unit test problems can
be solved.

Moved the core and access priorities for flow mods from Forwarding to
Controller and make it a property of IOFSwitch.

Waiting for L2_SET_TABLE_REPLY message to be speced.

Need to add unit tests for L2_TABLE_SET

* Don't rename the package yet though.
* Add OFBsnL2TableSetVendorData.java and OFBsnL2TableVendorData.java

OrderedCollection is a marker interface that extens Collection. It
simply clarifies that the Collection has a well-defined iteration oder
although the interface itself doesn't specify the order. It's used to
return ordered PortChangeEvents

Topolgoy: don't remove ports the collection returned by the switch.  Make BVS port names case-insensitive