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.

Add support for autobootstrapping a cluster without relying on manul configuration or configuration in cassandra

Necessary step for switch sync. We can't use
IFloodlightProvider.getSwitches() anymore. We now have a getSwitch()
method. There are also methods to get all dpids (getAllSwitchDpids())
and to get a map (getAllSwitchesMap()). These two return a snapshot.
TODO: need to check if they are used under the correct assumption in
existing code.

First stab at SwitchSyncRepresentation, which is the object I indent to
put in the SyncStore.

o IPV4SubnetTrie Enhancements:
    o Method to get the slices (absent keys) of a given key against the trie
    o Updated shortestNonMatchingPrefixLen to use a /32 key
o VirtualRouting Flow Reconciliation Changes:
    o Support for processing slices and generating OFMatchReconcile objects for each slice
o VirtualRouterManager Changes:
    o Store Src IP CIDRs in routing rules within a trie
    o Store Dst IP CIDRs in routing rules within a trie
    o PacketIn Flow:
        o Prefix is calculated as max of the shortestNonMatchingPrefix against the src/dst routing rule subnets and interface subnets
    o Reconciliation Flow:
        o getSlices against the src/dst routing rule trie of the input src/dst CIDR.
        o If no further slices of the input CIDR are generated by the routing rule trie, getSlices against the interface subnets