Clouddatabases javadocs fixes
Add Neutron v2.0 client implementation

1. Quantum v1.0 was removed beacause it can not be used in Folsom, Grizzly, ...
   OpenStack releases.
2. Entity schema was changed. We have Network, Subnet, Port entities now.
3. *Api classes were updated to v2.0 as well

JIRA issue link:
https://issues.apache.org/jira/browse/JCLOUDS-176