implement extention - 4.0 plus. join us

[bboyHan]

#1328

changelog：

1. add neutron class time field about [network/subnet/port];
2. optimize some code to replace the Deprecated methods and fields;
3. add neutron api implement extention about network-ip-availabilities;(link: https://docs.openstack.org/api-ref/network/v2/#network-ip-availability-and-usage-stats);
4. add (Neutron) resource tags operation. (link: https://docs.openstack.org/api-ref/network/v2/#standard-attributes-tag-extension);

[bboyHan]

5. add qos policy extension; (link: https://docs.openstack.org/api-ref/network/v2/#qos-policies-qos)

[olivergondza]

@bboyHan, you seem to have filed this in an incorrect project.

Also, never mix unrelated changes in a single PR. And careful with code reformats, it is best avoided in distributed development. In openstack4j/openstack4j we would have to do so, but in a coordinated way: openstack4j/openstack4j#21