Let's try this again. Fixed the two SFP bugs (Maxence's bug and another that prevented adding drop flows with null or empty-string actions). Also, replaced netty with a newer version in preparation for SSL support.

Revert "Fixed a couple bugs in SFP. (1) Always check the switch we're pushing a new flow to to see if an old flow needs to be removed from another switch (Maxence's bug). (2) Check for empty string in action lists and only print/add actions if they are specified. This allows an empty string or null to mean 'drop.'"

This reverts commit e2458ef3.

Fixed a couple bugs in SFP. (1) Always check the switch we're pushing a new flow to to see if an old flow needs to be removed from another switch (Maxence's bug). (2) Check for empty string in action lists and only print/add actions if they are specified. This allows an empty string or null to mean 'drop.'

Initial OF1.3 handshake working. Still trouble write()ing to OFSwitch instance after handshake complete. The Connection is reported as down, yet the switch is echoed repeatedly w/o a problem...

This reverts commit 4ae94669.

Refactored structure of core components to work with openflowj-loxi.
Presently refactoring Routing, Firewall, Forwarding, DeviceManager,
LinkDiscovery, Topology, and LearningSwitch.
Hub has been refactored.

amend to PR #443

Build is broken, but someone could fix this.  All they have
to do is fix all of the compile errors and update the hand
shaking logic.

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

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

* add methods to update/compare the ports of an IOFSwitch
* use ImmutablePorts
* OFPhysicalPorts -> ImmutablePort in most test

* consolidate store after SLAVE->MASTER transition
* more unit tests for Controller and OFChannelHandler
* fix some issues found while unit testing

bootstrap a cluster without needing to use SyncClient manually
2) Configure sync service to use authenticated connections by default
3) Set up VM with a default set of authentication credentials which
at the moment are simply generated a VM build time.
4) Some improvements to cleanup of netty to avoid leaving around
non-daemon timer threads that prevent clean shutdown.

Work in progress. Code and testing is in, some plumbing still missing.