Allow Actions to return results (Result Object in ActionResponse).

Adds an Object result field to ActionResponse, so Actions can store
a result there.
The field is intended to hold the result of the execution
when execution has finished successfully, and should be null otherwise.
Even when an action has been executed successfully, its result may be null.
Merge pull request #644 from isartcanyameres/feature/action-returns

Feature/action returns
DOSGi version upgraded to 1.5.0. It solves ConcurrentModificationException's executing OpenNaaS.
Merge pull request #649 from logoff/issue/dosgi-exception

DOSGi version upgraded to 1.5.0.
CheckParams method for createOFForwardingRule action.
CreateOFForwardingRule action implementation.
SDNNetwork model.

SDNNetworkModel contains SDNNetworkOFFlow.

SDNNetworkOFFlow represents a flow traversing the network following a path.
SDNNetworkOFFlow contains the Path it follows (from network model) and other OFFlow properties (SDNNetworkOFFlow extends OFFlow).

OFFlow has been created from FloodlightOFFlow, and FloodlightOFFlow changed to extend from OFFlow.
The difference between these two classes is that FloodlightOFFlow represents a flow entry inside a switch (and it holds the switch id),
while OFFlow is a generic flow representation.
Implement Bootstrapper that does not reset model.
Define and implement OFProvisioningNetworkCapability.

FlowIds are randomly generated UUIDs.

TODO: obtain result from ActionResponse and return it in capability methods.
Merge branch 'develop' into feature/of-net-model
OFProvisioningNetworkCapability getAllocatedFlow method returns result taken from action response.
Define SDNNetworkInternalActionsetImplementation providing an (empty) implementation for OFProvisioningNetworkActionSet.
Register sdnnetwork bundle in parent pom
ITest for sdnnetwork being correctly published.
Features modified to start openflow switch bundles.
Removed queue from forwardingCapability and test skeleton for capability + action.
Merge pull request #660 from adrian-rosello/feature/offorwarding-actionset

Features corrected and first implementation of createOpenflowForwardingRule action
Bug in ofswitch bootstrapper and first draft of createAction test.
Merge pull request #652 from isartcanyameres/feature/of-net

SDN network resource bundle skeleton.
Merge pull request #653 from isartcanyameres/feature/of-net-model

Feature/of net model