Use Resource class from Oslo

Most methods of Resource class from keystoneclient are similar to methods
from common code.
In the process of unification of the clients code we should
reuse common functionality from Oslo.

Related to blueprint common-client-library-2

Change-Id: I5858eec1596a6921dcf49dfcefb7abd4387de73b

keystoneclient/base.py

@@ -26,7 +26,7 @@ import six
 from six.moves import urllib
 
 from keystoneclient import exceptions
-from keystoneclient.openstack.common import strutils
+from keystoneclient.openstack.common.apiclient import base
 
 
 def getid(obj):
@@ -385,82 +385,11 @@ class CrudManager(Manager):
             return rl[0]
 
 
-class Resource(object):
+class Resource(base.Resource):
     """Base class for OpenStack resources (tenant, user, etc.).
 
     This is pretty much just a bag for attributes.
     """
 
-    HUMAN_ID = False
-    NAME_ATTR = 'name'
-
-    def __init__(self, manager, info, loaded=False):
-        """Populate and bind to a manager.
-
-        :param manager: Manager object
-        :param info: dictionary representing resource attributes
-        :param loaded: prevent lazy-loading if set to True
-        """
-        self.manager = manager
-        self._info = {}
-        self._add_details(info)
-        self._loaded = loaded
-
-    @property
-    def human_id(self):
-        """Human-readable ID which can be used for bash completion.
-        """
-        if self.NAME_ATTR in self.__dict__ and self.HUMAN_ID:
-            return strutils.to_slug(getattr(self, self.NAME_ATTR))
-        return None
-
-    def _add_details(self, info):
-        for (k, v) in six.iteritems(info):
-            setattr(self, k, v)
-            self._info[k] = v
-
-    def __getattr__(self, k):
-        if k not in self.__dict__:
-            #NOTE(bcwaldon): disallow lazy-loading if already loaded once
-            if not self.is_loaded():
-                self.get()
-                return self.__getattr__(k)
-
-            raise AttributeError(k)
-        else:
-            return self.__dict__[k]
-
-    def __repr__(self):
-        reprkeys = sorted(k for k in self.__dict__ if k[0] != '_' and
-                          k != 'manager')
-        info = ", ".join("%s=%s" % (k, getattr(self, k)) for k in reprkeys)
-        return "<%s %s>" % (self.__class__.__name__, info)
-
-    def get(self):
-        # set_loaded() first ... so if we have to bail, we know we tried.
-        self.set_loaded(True)
-        if not hasattr(self.manager, 'get'):
-            return
-
-        new = self.manager.get(self.id)
-        if new:
-            self._add_details(new._info)
-
     def delete(self):
         return self.manager.delete(self)
-
-    def __eq__(self, other):
-        if not isinstance(other, Resource):
-            return NotImplemented
-        # two resources of different types are not equal
-        if not isinstance(other, self.__class__):
-            return False
-        if hasattr(self, 'id') and hasattr(other, 'id'):
-            return self.id == other.id
-        return self._info == other._info
-
-    def is_loaded(self):
-        return self._loaded
-
-    def set_loaded(self, val):
-        self._loaded = val