Openstack driver : static networks and fixed issues

* Allow bootstrap using static networks
* Update network resource creation flow 
* Validations – static resources are validatated before bootstrap.
* Enable jersey logging (wire logs) : Add openstack.wire.level=FINEST in gs_logging.properties to activate it.
* Clean up all resources after a bootstrap failed.
* Support not setting the network block.
* Management network can now have multiple subnet.
* Included applicative network includes the application name.
* Endpoint property 'jclouds.endpoint' renamed into 'openstack.endpoint'.
* Make org.cloudifysource.esc.driver.provisioning.openstack.OpenStackBaseClient thread safe.
* Automatically search for quantum/neutron endpoint (you can still specify service name if needed).
* In startMachine(), if management network is not found in esm, no error is thrown and we later get a NPE.