Full flavor CRUD

Flavor CRUD v2

To use the low level api for the resource:

    from openstack.compute.v2 import flavor
    resp = flavor.Flavor.get_data_by_id(sess, '102')

The resp will be a dictionary.

Change-Id: I3a835e4e7ea5dd6e62cdd91748589edf54c0dcf9
Merge "Full flavor CRUD"