WS test for OpenflowForwardingCapability in switches and OFProvisioningNetworkCapability in sdnnetworks.
Register OFProvisioningNetworkCapability as an OSGi service and expose it through WS.
Fix error in test. Add switchId to created forwarding rules.
Give time for dosgi to register/unregister WS before next test.

Without this workarround, some WS tests were accessing capabilities from previous tests,
resulting in internal failures, such as resource not found.
Merge pull request #719 from isartcanyameres/fix/sdnnet-ofcapab-ws

Fix/sdnnet ofcapab ws